Must-See Celeb Sightings: April 15-21, 2019

The poor unfortunate souls who had to walk behind this Ursula costume! Perry pulled out all the stops for American Idol's Disney Night on April 21, posing with her far more casually dressed fellow judges on the red carpet in Los Angeles.

The Duchess and Duke of Cambridge may have been wearing blue, but they were beaming before attending Easter service at St. George's Chapel at Windsor Castle on April 21.

The rapper performed during his much-anticipated Sunday Service on Easter during the second weekend of the 2019 Coachella Valley Music and Arts Festival. For even more pics from Indio, click here.

The former Scream Queens star and her new beau got their Easter shopping on in Los Angeles on April 21.

Stylish and sporty! The 29-year-old actress flashed a smile while out in Los Angeles on April 20. 

The League alum chatted about his cartoon comedy series, Big Mouth, at the Netflix Adult Animation Q&A event in Hollywood on April 20.

The Keeping Up With the Kardashians star looked crazy good in a very sheer black dress as she headed to sister Kourtney Kardashian's 40th birthday party in Los Angeles on April 19.

The "Make Me Feel" singer got the Coachella crowd pumped up during her weekend two performance on April 19.

The newlywed looked tan-tastic in a Max Mara ensemble as she took a stroll through New York City on April 19.

The former DWTS pro was a fresh-faced beauty after a dance class in Los Angeles on April 19.

Back from Coachella, the Keeping Up With the Kardashians star rocked an all-black, skintight spandex outfit and a camo New York Yankees cap for a Beverly Hills lunch outing on April 19.
 

The "Yeah" singer checked out The Chainsmokers' resident set at XS Nightclub at Wynn Las Vegas on April 19.

Sunny disposition! The Isn't It Romantic star was enthusiastic outside the BBC Radio 2 studio in London on April 19.

Clad in a bright purple suit, the "Make It Better" singer flashed a big smile before getting into a car in New York City on April 19.

Superhero hug! Ant-Man and Hawkeye had nothing but love for each other at the Avengers: Endgame premiere in Shanghai, China, on April 18.

Hours before news of her breakup broke, Williams was in a great mood alongside her Fosse/Verdon co-star at a 92nd Street Y screening of their FX show in New York City on April 18.
 

Got the blues! The Operative actress turned the streets of New York City into her very own runway while heading to an event on April 18.

The "If My Heart Had a Heart" singer paid thanks to her fans while performing in the CMT Next Women of Country concert in Atlanta, Georgia, on April 18.

The Voice coach was in a cheerful mood after having dinner with friends at Madeo restaurant in West Hollywood on April 18.

Ray of sunshine! The Modern Family star brought the happy to Tacoma, Washington, where she spoke during a WE Day celebration on April 18.

The "Crown" singer basked in her post-workout glow in Beverly Hills on April 18.

So romantic! The British actress was an ethereal dream at the opening ceremony of Chanel's "Mademoiselle Prive" exhibition in Shanghai on April 18.

The fashion designer twins were, well, twinning in a rare public appearance together at the Youth America Grand Prix's 20th Anniversary Gala in New York City on April 18.

Yas, Captain America! Evans seemed to derive extra power from the fans who were just as stoked to see him at a Shanghai fan event for Avengers: Endgame on April 18.

No pants, no problem! The 22-year-old model left a hot Pilates class in Los Angeles on April 18 in a pink sweatshirt, gold aviators, white sneakers and a scrunchie, plus an extra dose of hydration with her PATHWATER.

The Oscar winner obliged a fan with a selfie as she left her London hotel en route to a taping of The Graham Norton Show on April 18.

The Triple Frontier star was seen going through his morning routine in the City of Angels on April 18.

The couple that shops together, stays together! The newlyweds ran errands on Melrose Place in L.A. on April 18.

The blonde beauty kept things casual while out and about in Los Angeles on April 18.

Back home in Germany! The cute couple stuck close together at the 3rd About You Awards in Munich on April 18.

The Victoria’s Secret Angel rocked a metallic pink jumpsuit at a celebration of the new Incredible by Victoria’s Secret collection at 1 Hotel Miami on April 18.

Hi, Uma! The Chambers star gave a wave before getting into a car after visiting Build Studio in NYC on April 18.
 

The Pimp star looked fierce in a leather patchwork Coach jumpsuit outside the Good Morning America set in NYC on April 18.

Turning down for Tokyo! The "Alive" rapper was in full swagger mode in a colorful suit at the grand opening of MCM's largest flagship store in Ginza, Tokyo, on April 18.

The engaged duo flashed grins as they headed to Lopez's Hustlers set in Brooklyn, New York, on April 17.

Glow to it! The California girl layered up for dinner with a pal in New York City on April 17.

Bring on the drama! The Jane the Virgin star was trailed by a gorgeous floral train at the premiere of her new Netflix movie, Someone Great, on April 17.

The fashionable actresses came together at the Apex for Youth 27th Anniversary Inspiration Awards Gala in New York City on April 17.

How on-point! The Australian actress, who will play Batwoman on Gotham, slipped into a Batman tee after a workout in Los Angeles on April 17.

Pretty in pink! The Guava Island star was all suited up for an afternoon of apartment hunting in New York City on April 17.

Teamwork makes the dream work! Legend joined Mai onstage during her Los Angeles show at The Novo on April 17. The pair performed their duet, "Everything," off the English singer's self-titled debut album.

How sweet! The reality star-turned-Skinny Girl founder posed with the giant-sized frappe of our dreams at the GODIVA Café grand opening in New York City on April 17.

Springing ahead! The Neighborhood star was in bloom while visiting Build Studio in New York City on April 17.

Looking fabulous in a striped silk suit, peep-toe heels and oversized black sunglasses, The Widow star was in a great mood as she returned to her New York City hotel after taping The Tonight Show Starring Jimmy Fallon on April 17.

Getting her sweat on! The "Sober" singer was seen leaving a Los Angeles gym in a long-sleeved tie-dye shirt, bike shorts and white sneakers and carrying a duffel bag on April 17.

The father of three was seen out on a stroll in Los Angeles on April 17.

The Ocean's 8 actress rocked a turquoise suit while visiting BBC Radio 2 in London on April 17.

Is this not the most glam way to ride a carousel? Perry went for a spin while visiting Disneyland on April 16 with her fellow American Idol judges. The ABC show was at the Anaheim, California, theme park for a special Disney-themed Top 10 taping.

Paw patrol! The This Is Us star made a new furry friend while visiting Hallmark's Home & Family at Universal Studios Hollywood on April 17.

The Booksmart director wasn't looking back while visiting the City by the Bay to screen her directorial debut during the 2019 San Francisco International Film Festival on April 16.

Pops of lime and a dark red lip amped up the Quantico alum's white ensemble as she stepped out in New York City on April 16.

The Modern Family star looked trés chic as she met up with pals in Los Angeles on April 16.

Holmes held onto her man's arm after a brunch date in New York City on April 16.

Red hot! Kloss put on a modeling clinic at the Top Chef and Project Runway "A Night of Food and Fashion" FYC red carpet event at Vibiana in New York City on April 16.

The On the Basis of Sex actor was back on his gold bicycle, riding around New York City on April 16.

Denim diva! RiRi was beaming after dining out in New York City on April 16.

Ballerini got emotional as Underwood surprised the sold-out crowd at the Opry House in Nashville on April 16, inducting the "Peter Pan" singer into the Grand Ole Opry. "Grand Ole Opry, thanks for seeing something in me and for believing that I’ll always love you like I do because I do, and I will," the 25-year-old country singer said onstage while clutching her award. The pair then performed a duet of Trisha Yearwood's 1992 hit, "Walkaway Joe."

The former first lady was glowing as she waved to fans at the Paris stop on her Becoming book tour on April 16.

The "In My Blood" singer certainly has music in his veins, rocking out hard during the London stop of his tour at the O2 Arena on April 16.

We'll take another, bartender! The Saturday Night Live writer-performer doled out Grey Goose drinks for surprised patrons while helping launch Live Victoriously at Underdog in New York City on April 16. Though his girlfriend, Scarlett Johansson, was not in attendance, a witness tells ET that he did share with disappointed bar patrons who asked if he was single, "Unfortunately, I am not."

The Game of Thrones star was spotted out in London's Mayfair district on April 16.

The actresses bonded at a Sakara Life and Rothy celebration of the Eat Clean, Play Dirty cookbook launch in Beverly Hills on April 16, where guests enjoyed Clase Azul tequila cocktails.