Must-See Celeb Sightings: March 11-17, 2019

Cheers! The Duke and Duchess of Cambridge enjoyed glasses of Guinness as they met with Irish Guards after attending the St. Patrick's Day parade at Cavalry Barracks in Hounslow, England, on March 17.

The newly engaged couple looked happier than ever as they stepped out arm in arm in New York City on March 17.

Ladies in red! The blonde beauties stunned in ruby dresses at the 5th Annual Fashion Los Angeles Awards, with FIJI Water, in Los Angeles on March 17. Check out even more fabulous looks from the awards show here.

The Real Housewives of Beverly Hills star and her husband, Edwin Arroyave, brought their kids, Cruz, Slate and Isabella, to the Monster Energy NASCAR Cup Series race at Auto Club Speedway in Fontana, California, on March 17.

Stormi's mama looked chic in an all-black ensemble during a girls night out at The Nice Guy in West Hollywood on March 16.

The Chilling Adventures of Sabrina star held court at a Q&A and reception for her Netflix show in West Hollywood on March 17.

An actress in bloom! The Mom star picked up fresh flowers and a few other goodies at a Los Angeles farmers market on March 17.

The actors posed together at a photocall for their upcoming drama, The Best of Enemies, at the Whitby Hotel in New York City on March 17.

The couple got all glammed up for the 6th Annual "A Night on the Runwade" event in Miami, Florida, on March 16.

Lewis put a bow on her night out in Las Vegas, meeting up with the American Idol judge on the purple carpet at the 23rd annual Keep Memory Alive "Power of Love Gala" benefit for the Cleveland Clinic Lou Ruvo Center for Brain Health at MGM Grand Garden on March 16.

Can't shush these ladies! The trio stunned at the Pretty Little Liars: The Perfectionists premiere in Hollywood on March 15.

The Us star looked incredibly chic as she left BBC Radio 2 in London, England, on March 15.

He may have been in the concrete jungle, but that didn't stop the Shazam! star from hanging ten in New York City on March 15.

T*ts up! The Marvelous Mrs. Maisel co-stars stuck close together at the 2019 PaleyFest LA event for their Amazon Prime hit at the Dolby Theatre in Hollywood on March 15.

The recently engaged singer gave us another flash of her blinding engagement ring as she left the gym in Miami, Florida, on March 15.

The Game of Thrones alum and the DNCE frontman walked and talked arm in arm through NYC's SoHo neighborhood on March 15.

The 45-year-old actress looked ready for spring in one of her own designs as she visited the New York & Company Store in Burbank, California, on March 15.

Brr! The actor known as Doctor Strange pulled a superhero move, swimming in cold water to support Red Nose Day, which benefits mental health programs, in London, England, on March 15.

The Big Little Lies star went jogging with a pal in Los Angeles on March 15.

Off to the races! The "Trigger Bang" singer made goofy faces during Gold Cup Day at the 2019 Cheltenham Festival in England on March 15.

Gavin Rossdale happily led his rock group through their hits during a kick-off weekend performance inside the Barbershop Cuts & Cocktails at The Cosmopolitan of Las Vegas on March 15.

Considering he's gone from the Upside Down to the underworld, the actor was nothing but friendly at a Hellboy: Rise of the Blood Queen photocall in Mexico City on March 15.

After presenting Garth Brooks with the Artist of the Decade award, Pratt happily belted out a tune with the country legend during the 2019 iHeartRadio Music Awards in L.A. on March 14.

The Nashville alum sung a diddy at the Bluebird premiere during SXSW on March 14.

All the high fives! Levi greeted everyone along the red carpet at the unveiling of the Shazam! World Exclusive Fan Experience in Toronto, Canada, on March 14.

Motorin'! The A Star Is Born actor-director had his helmet in hand after a motorcycle ride in Los Angeles on March 14.

The actresses had each other's backs at the NYC premiere of The Act on March 14.

The techy model looked downtown chic in all-black, including a Ralph Lauren jumpsuit, as she headed to the Neiman Marcus opening at NYC's Hudson Yards on March 14.

The One Tree Hill alum flashed a sly grin after dining out in Los Angeles on March 14.

Us may be a thriller, but the co-stars joked around on the red carpet at a screening for their new Jordan Peele-directed flick in London on March 14.

Smile and play ball! The engaged actors got their sweat on at a New York City basketball court, shooting hoops on March 14 with fun, yellow smiley face balls. 

The Ocean's 8 actress looked super chic at the Watches of Switzerland Hudson Yards in NYC on March 14. 

The dad of three appeared to be in an upbeat mood while out and about in L.A. on March 14.

The Bachelor loves dined out at Vandal in New York City on March 14, enjoying a meal and cocktails and posing with a funky purple art piece before heading to see Frozen on Broadway.

Strike a pose! The TV personalities cycled through the launch party for Wheels, Califonia's new bike-share app, at Los Angeles' Sunset Tower on March 14.

Life's a circus! The 42-year-old actor thanked fans at the Tokyo premiere of Dumbo on March 14.

The blonde beauties had a bear-y good time at the MCM global flagship opening in Beverly Hills on March 14.

How can you not love these two? The gorgeous couple looked fabulous at the People's Postcode Lottery Charity Gala in Edinburgh, Scotland, on March 14.

Outfitted in plenty of denim, the Dawson's Creek alum went shopping at Madewell in New York City on March 14.

The TV host hung out with a few of her pals at Ray's Moxie Made pop-up shop during SXSW in Austin, Texas.

Who needs a selfie? The "My Bad" singer snapped a pic of the audience, who were enjoying McDonald's faves, during his Uber Eats stage performance at SXSW in Austin, Texas, on March 14.

The new couple walked hand in hand while out in central London on March 14.

The Danish model checked out the new goods at a VIP event celebrating UNIQLO's Hudson Yards store opening in NYC on March 14.

The soon-to-be royal dad kept his ears open while listening to speakers at the Veterans' Mental Health Conference at King's College in London on March 14.

Seeing double! The "Level Up" singer proudly held up a copy of her InStyle cover as she left a dinner at 15 Hudson Yards in New York City on March 13.

Livin' in the limelight! Knightley was a neon dream in a flowy tulle frock at a New York City screening of The Aftermath on March 13.

Pastel princess! The supermodel looked lovely in shades of pink at the OMEGA Lisbon Boutique Store official opening in Portugal on March 13.

Funny buddies! Bryan's SNL pals supported her at the premiere of her new show, Shrill, in New York City on March 13.

Ethereal beauty! Cruz wowed in white at the Dolor y Gloria premiere in Madrid, Spain, in March 13.

Sweet tooth! The Famous in Love actress treated herself to some tasty treats at the launch of Thorne by Bella at Sugar Factory Ocean Drive in Miami Beach, Florida, on March 13.

Blast from the past! The Masked Singer alum pulled out his best *NSYNC pose at the premiere of The Boy Band Con: The Lou Pearlman Story during the 2019 SXSW Conference and Festivals in Austin, Texas, on March 13.

The married couple showcased two very different styles as they left their New York City apartment on March 13.

Dunkin' iced coffee in hand, the Boston native was in a fantastic mood while out in Los Angeles on March 13.

Got the blues? Not these two! The Bachelor duo couldn't stop smiling as they finally stepped out publicly in New York City on March 13.

The 55-year-old actor gave a wave while out in Paris, France, on March 13.

All black everything! The model turned the streets of NYC into her runway on March 13.

The makeup mogul put her curves on display in a taupe, ruched tube dress by Norma Kamali from WGACA and Femme La lucite mules after dining with her older sisters, Kim, Kourtney and Khloe Kardashian, at Giorgio Baldi in Santa Monica, California, on March 12.

The Beckhams coordinated in black-and-white ensembles for the 2019 Portrait Gala in London, England, on March 12, though Victoria did add a fun pop of color with neon pink heels.

The Clooneys had a laugh while chatting with the Prince of Wales at a dinner celebrating The Prince's Trust at Buckingham Palace in London on March 12.

There was a major model moment happening at the launch of Ian Schrager's Times Square EDITION Hotel in New York City on March 12. A source told ET that Jenner and Bieber arrived together and were inseparable at the party, walking around together and sitting with Delevingne and Suki Waterhouse for dinner. 

The GRAMMY winner and The Predator star both looked picture perfect at The Hollywood Reporter and Jimmy Choo's Power Stylists Dinner in Beverly Hills on March 12.

The actresses bonded at Marie Claire's Hollywood's Change Makers event in Los Angeles on March 12.

The Five Feet Apart co-stars got goofy at Build Studio in New York City on March 12, linking arms as they struck strongman poses. 

The "Sucker" singer and his fiancée held hands during an afternoon of NYC shopping with Turner's parents on March 12.

All eyes were on the funny lady at the Los Angeles Community College 2019 Gala in Beverly Hills on March 12.

The adorable actress was game to snap a selfie stick-assisted pic with a fan at the Teen Spirit premiere during the 2019 SXSW Conference and Festivals in Austin, Texas, on March 12.

The Dirty John star was sitting pretty at The Mustang after-party at Le Jardin in Hollywood on March 12.

Leopard print FTW! The British actress was spotted out in New York City on March 12.

Babies on the brain! The Duchess of Cambridge happily hung out with some very cute tots at the Henry Fawcett Children's Centre in London, England, on March 12.

The Riverdale star gave a wave as he made his way onto The View set in New York City on March 12.

The 44-year-old actress blazed ahead at the Dolor y Gloria photocall in Madrid, Spain, on March 12.

The country singer celebrated her 20th anniversary as an Opry member, performing "Sweet Dreams" at the Grand Ole Opry on March 12. She was also presented with a Hatch print to commemorate the big night.

The proud mom of six was beaming as she walked two of her kids, son Knox and daughter Zahara, down the red carpet at the Dumbo premiere at the El Capitan Theatre in Hollywood on March 11.

Move over, Barbie! The "Good Form" rapper held on tightly to a giant neon pink stuffed unicorn as she left Opium nightclub in London, England, on March 11.

Pretty in pink! Clad in a pastel puffer, the mom of three flashed a smile during her morning routine on March 11, smiling as she held onto a coffee cup after dropping her kids off at school.

The actors hung out backstage at a Featured Session event with Poppy Harlow during SXSW on March 11.

The newest America's Got Talent judge made a bold debut at the season 14 kick-off party in Pasadena, California, on March 11.

Good news? The Younger star was couldn't stop laughing as she took a phone call during a break in filming in New York City on March 11.

Two thumbs up for these dudes! The actors showed their appreciation at the Good Boys premiere during SXSW in Austin, Texas, on March 11.

Golden boy! Theroux took his gilded bike for a spin in New York City on March 11.

SJP had a colorful day filming her HBO series, Divorce, in New York City on March 11.

The Duchess of Sussex happily accepted a bouquet of flowers from a young royal fan as her proud hubby looked on during a Commonwealth Day Youth Event at the Canada House in London on March 11.

The redheaded beauty snapped a selfie with a fan at the premiere of The Day Shall Come at SXSW on March 11.

The royal mom of three was a vision in red at a Commonwealth Day service at Westminster Abbey in London on March 11.

The brains behind the upcoming show, Shrill, struck goofy poses onstage during a Featured Session panel at SXSW on March 11.

The model looked radiant while out in New York City on March 11.

Fresh off the release of her sophomore album, Girl, the country singer held tightly onto her to-go coffee while out in New York City's Tribeca neighborhood on March 11.

The "Sue Me" singer left us green with envy after she visited Z100 in New York City on March 12.

The "Close to Me" singer flashed a grin while out in NYC on March 11.

Smooches! The Black Monday star had nothing but love for the new dad as he visited Cohen's "Radio Andy" show at SiriusXM Studios in New York City on March 11.

Real men wear pink! The middle JoBro rocked a pastel coat with plenty of pocket space as he chatted on the phone in New York City on March 11.

The This Is Us star was all smiles at a Breakthrough screening in New York City on March 11.

Diggin' on Chilli! The TLC singer stopped by the Fast Company Grill in Austin, Texas, on March 11.

The "Praise the Lord" rapper got up close and personal with fans at a "Featured Session: Using Design 'Differently' to Make a Difference" panel during SXSW in Austin, Texas, on March 11.

The Jonas Brothers-John Stamos T-shirt prank continues! The "Chains" singer was spotted out in New York City in a tee that sported a pic of the Full House star wearing a JoBros shirt (got all that?). Jonas even joked to Stamos on Instagram, "It's your move."