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

She's in bloom! The Stranger Things star traded her weapons for flowers in a pretty collared Dolce&Gabbana tea-length, floral-and-lace dress during the 2019 Giffoni Film Festival in Italy on July 21.

The blonde beauty looked positively joyful while out with husband Justin Bieber (not pictured) in Los Angeles on July 21.

The Riverdale stars were back in action at a panel for their hit CW show during Comic-Con in San Diego on July 21.

The 28-year-old actress rocked a summer-ready ensemble during a trip to the grocery store in Los Angeles on July 21.

The Peppermint star looked regal in a royal blue dress with black heels and a black bag as she was spotted walking around Los Angeles on July 21, shading her eyes from the brightness of the summer day with some dark sunglasses.

The Hills: New Beginnings star and the Mean Girls actor charmed at the 2019 Don't Hide It Flaunt It Awards in Beverly Hills on July 21.

The GRAMMY winner delighted the standing room only crowd when she closed out ComplexCon Chicago on July 21.

The RuPaul's Drag Race star and the "Personal Hell" singer posed together at the AT&T Big Queer Brunch at Mondrian Los Angeles in West Hollywood on July 21.

The Carnival Row stars buddied up at the Come As You Are Party during Comic-Con in San Diego on July 20.

The "Bad Guy" sported her signature oversized sartorial style to Chanel's J12 Yacht Club dinner in Shelter Island, New York, on July 20.

The Bronx babe dazzled during her set at the California Mid-State Fair in Paso Robles on July 20.

Holding hands with her boyfriend and The Soundflowers bandmate, Jackson flashed a peace sign as the pair left Good Times at Davey Wayne's following their performance at the Hollywood bar on July 20.

The "Juice" singer took over the main stage of the Capitol Hill Block Party in Seattle on July 20.

The eldest JoBros didn't seem too disturbed by the crazy high temps battering the East Coast as they headed out for a walk in New York City's SoHo neighborhood on July 20.

The Australian rapper struck a pose at "In My Defense" pop-up in Los Angeles on July 20. 

What a cute four-legged friend! The brunette beauty took her dog for a walk in Los Angeles on July 20.

The "Sorry" singer hit the streets of Los Angeles on July 20 in a head-to-toe lilac ensemble.

The 38-year-old actor took in the scene from the stage during Hulu's Veronica Mars fan event at NeueHouse Hollywood on July 20.

The 57-year-old actor seemed pretty excited to receive the François Truffaut Award at the Giffoni Film Festival in Italy on July 20.

Pure magic! The celeb chef had a delightful day at the Create & Cultivate Self-Care Summit in Los Angeles on July 20.

Despite a solid chunk of the country being in the middle of a blistering heatwave -- including the New York City metropolitan area -- the "Medicine" singer stepped out in a Guess camo sweatsuit with the hood up as she headed into the Prudential Center in Newark, New Jersey, for her July 19 tour stop.

The American Horror Story actress was in a good mood as she wandered around Los Angeles with an iced coffee in hand on July 19.

The 44-year-old actress looked white-hot as she celebrated her Haute Living magazine cover in Miami.

Yacht rockin'! The Rook star wowed in white on the #IMDboat during the second day of San Diego Comic-Con 2019.

Snoochie boochies! During 2019 Comic-Con International, The Jay and Silent Bob Reboot stars were honored with a TCL Chinese Theatre handprint ceremony at San Diego's Theatre Box on July 19.

The "Rainbow" singer hit the stage for TODAY's Citi Concert Series at New York City's Rockefeller Plaza on July 19.

The Boys star made a dapper turn at 2019 Comic-Con International on July 19. For even more pics from the supercharged San Diego festival, click here.

The Avengers: Endgame actress beat the heat with an iced drink from Alfred Coffee in Studio City, California, on July 19.

We missed you! The punk rockers performed in Central Park's Rumsey Playfield for Good Morning America on July 19.

Orange you glad to be a Belieber? The Canadian pop star was spotted in another one of his Drew ensembles after landing at Teterboro Airport in North Jersey on July 19.

We were green with envy over Longoria's appearance on Un Nuevo Dia in Miami on July 19, where she was promoting Dora and the Lost City of Gold.

The Quantico alumna looked happier than ever celebrating her 37th birthday with her husband and friends in Miami on July 18, where she enjoyed a late dinner at David Grutman's Komodo followed by a celebration at LIV. At the restaurant, Chopra Jonas was presented with an over-the-top red-and-gold birthday cake that perfectly matched her b-day look.

Hours after taking the stand on the first day of her "Dark Horse" copyright trial on July 18, Perry was seen exiting West Hollywood hot spot Craig's arm in arm with a male pal. The Santa Barbara native wore a midnight blue latex trenchcoat and ankle-strap snakeskin-print sandals for the night out.

After officially announcing their coupledom, the lovebirds were spotted embarking on a busy day in Los Angeles on July 18, stopping at a dry cleaners ahead of a sushi lunch date.

The fresh-faced triple threat surprised fans on July 18 at an advanced screening of her upcoming movie, Hustlers, in New Jersey.

We love this chic look the tennis pro wore to the Sports Illustrated Fashionable 50 event at The Sunset Room in L.A. on July 18.

The Bohemian Rhapsody star looked snazzy in a sunflower dress while co-hosting, along with Saks Fifth Avenue and Vogue, a tennis match between Andy Roddick and Luka Gregorc followed by a three-course al fresco dinner on the court at a private estate in Sagaponack, New York, on July 18.

Exercise for all! The NOS4A2 actor took his dog for a walk in L.A. on July 18. 

The 40-year-old actress looked easy breezy in a blue-and-white Reformation dress as she scrubbed away during C & The Moon’s first-year celebration in Malibu, California, on July 18.

The "If My Heart Had a Heart" singer rocked out during the 2019 Summer NAMM Jam Gibson Opening Party at Wildhorse Saloon in Nashville, Tennessee, on July 18.

The Inglourious Basterds star, who turned 43 earlier this week, gave off '70s vibes in a plaid wool vest, matching cuffed trousers and a suntan-and-ivory floral crushed silk-georgette blouse, all by Michael Kors Collection, en route to Build Studio in New York City on July 18.

Play ball! The America’s No. 1 Food Family host and her NBA pro hubby launched their Eat. Learn. Play. Foundation with an event in Oakland, California, on July 18.

The Summer House star looked stunning in a white dress as she dined at French restaurant Coco J'Adore in New York City's Meatpacking District on July 18.

The adorable couple palled around outside the Late Show With Stephen Colbert set in NYC on July 17.

The "Press" rapper made a colorful turn during a performance on Jimmy Kimmel Live! in Los Angeles on July 17.

A flower for Gaga! Mother Monster vamped things up at a party for her new beauty brand, Haus Laboratories, at A.O.C. Restaurant in Los Angeles on July 17.

The model-tech entrepreneur wowed in white after stopping by the Vogue House in London for the magazine's August Issue Live Signing on July 17. 

The comedy legends couldn't stop laughing during the L.A. Tastemaker event for Comedians in Cars at the Paley Center for Media in Beverly Hills on July 17.

What a reflection! The 24-year-old model was a denim diva at the WARDROBE.NYC launch of the Release 04 DENIM & Levi's  collaboration in New York City on July 17.

While running errands in Los Angeles on July 17, the Modern Family star was seen out with her engagement ring for the first time since Wells Adams' proposal.

Pretty in pink! The 30-year-old actress couldn't stop grinning during a busy press day in New York City on July 17.

The Dawson's Creek alumna looked casual cool as she hit the streets of New York City on July 17.

The Lucy in the Sky star looked gorgeous in a black floral frock at the Miss Dior Exhibition at the Museum of Contemporary Art in Shanghai, China, on July 17.

The California girl donned shades of white and tan while out in New York City on July 17.

The "11 PM" crooner and his sister, Manuela Londono Arias, had good deeds on the brain when they attended the El Arte de los Suenos Foundation Cocktail Party in Miami on July 17.

While outside Build Studio in the Big Apple on July 17, the "No Air" singer gave fans a double wave.

The 37-year-old actress donned a green maxi dress and aviator sandals while waiting for a cab in New York City on July 17.

The Watch What Happens Live With Andy Cohen host was all smiles as he hit the pavement in NYC on July 17.

Flower power! The This Is Us star stepped out in NYC in a bright pink floral dress for her appearance on the Wendy Williams Show on July 17.

The Saving Zoë stars took their sister act to the Elvis Duran and the Z100 Morning Show studio in NYC on July 17.

The boho chic model got the giggles as she left MèCHE Salon LA in Beverly Hills on July 16.

Hadid's model instincts were on display at the Fantasy Island-inspired Michael Kors Wanderlust fragrance event in New York City on July 16. She wore a suntan-colored, crushed satin charmeuse slip dress with feather trim from the designer's Fall 2019 collection for the occasion.