Celeb Spotter 067: Ariana Grande and Lady Gaga in NYC, celebs hit Wimbledon

Ariana Grande and Lady Gaga gave fans what they wanted in New York City this week.

Grande hit the stage at Amazon Music's Unboxing Prime Day concert on Wednesday night for some of her biggest super fans -- and hung out with Alessia Cara and Ashley Tisdale backstage! -- while Lady Gaga continued her streak of rocking head-turning styles while recording highly-anticipated new music in NYC.

Also this week, Drake, Justin Timberlake, Jessica Biel and Pippa Middleton all hit the All-England Club for Wimbledon, where they watched the likes of Serena Williams and Roger Federer play on Centre Court.

More of our favorite celebrity sightings this week were Jonah Hill, Sarah Hyland, Bethenny Frankel and Gigi Hadid.

See the best celebrity sightings of the week below:

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Celeb Spotter 067: Ariana Grande and Lady Gaga in NYC, celebs hit Wimbledon
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Celeb Spotter 067: Ariana Grande and Lady Gaga in NYC, celebs hit Wimbledon

Justin Bieber and Hailey Baldwin were spotted heading to dinner in Dumbo, Brooklyn on Thursday.

(Photo by Alessio Botticelli/GC Images)

"Modern Family" actress Sarah Hyland was spotted in workout clothes in Los Angeles on Wednesday.

(Photo by PG/Bauer-Griffin/GC Images)

Olivia Munn celebrated pal Serena Williams' semi-final win at Wimbledon on Thursday.

(Photo by Karwai Tang/WireImage )

Ashley Tisdale, Ariana Grande and Alessia Cara posed together backstage at the Amazon Music Unboxing Prime Day event at Brooklyn Navy Yard on Wednesday night.

(Photo by Kevin Mazur/Getty Images for Amazon)

Katy Perry and Orlando Bloom were spotted leaving Annabel's in London on Thursday night. 

(Photo credit should read PALACE LEE / Barcroft Media via Getty Images)

Lady Gaga rocked an all-leather getup on Wednesday while leaving her New York City recording studio.

(Photo by Say Cheese!/GC Images)

Drake was in the stands watching pal Serena Williams play at Wimbledon this week.

(Photo by Karwai Tang/WireImage )

Jonah Hills flashed a sly smile while walking around New York City with a giant water bottle on Wednesday.

(Photo by Raymond Hall/GC Images)

Ariana Grande and Pete Davidson held hands in New York City on Wednesday before Grande performed at the Amazon Music Unboxing Prime Day event.

(Photo by Raymond Hall/GC Images)

Bethenny Frankel stepped out for the launch party of Bulletproof's first-ever pop-up experience in New York City on Wednesday night.

(Credit: Michael Simon/startraksphoto.com)

Dwayne "The Rock" Johnson rocked a black-and-white Hawaiian shirt while making the rounds in New York City on Wednesday.

(Photo by Patricia Schlein/Star Max/GC Images)

Justin Timberlake and Jessica Biel attended Drake's party at Annabel's on in London on Tuesday night.

(Photo by Ricky Vigil M/GC Images)

Emma Roberts sported a sheer black dress while out and about in Los Angeles on Wednesday.

(Photo by gotpap/Bauer-Griffin/GC Images)

Gigi Hadid was feelin' the blues as she left her apartment in New York City on Tuesday.

(Photo by Say Cheese!/GC Images)

Pippa Middleton returned to Wimbledon for a second time this year on Wednesday in a blue dress that showed off her baby bump.

(Photo by Karwai Tang/WireImage )

Anna Wintour was all smiles as she arrived at Wimbledon for the men's semi-finals on Friday.

(Photo by Neil Mockford/GC Images)

Priyanka Chopra hosted a dinner at Wölffer Estate Vineyards with Saks Fifth Avenue and Vogue in celebration of summer on Thursday evening.

(Credit: Neil Rasmus/BFA.com)

Actor Tristan Wilds attended The Official After Party of Essence Fest, sponsored by Crown Royal, on Sunday in New Orleans.

(Credit: Getty Images)

Iggy Azalea showed off her signature curves while out doing some promo on Tuesday in Los Angeles.

(Photo by Paul Archuleta/GC Images)

Darren Criss performed at Krug Encounters Aspen on Thursday night, where he sang songs like "Let It Be" and "Free Falling."
 

(Credit: Krug Champagne)

Liev Schreiber was seen out and about in NoHo rocking a groutfit (grey outfit) on Tuesday.

(Photo by Robert Kamau/GC Images)

Ariana Grande performed at the Amazon Music Unboxing Prime Day event at Brooklyn Navy Yard on Wednesday night.

(Photo by Kevin Mazur/Getty Images for Amazon)

Lady Gaga was swarmed by fans when she left Milk Studios on Wednesday night in New York City.

(Photo by James Devaney/GC Images)

Liv Tyler stunned in all black while entering "The Late Show With Stephen Colbert" at the Ed Sullivan Theater on Thursday in NYC.

(Photo by James Devaney/GC Images)

Melanie Griffith proved she wasn't afraid of color while out and about in Los Angeles on Wednesday.

(Photo by gotpap/Bauer-Griffin/GC Images)

Kristin Chenoweth and her dog, Thunder, were spotted at LAX on Thursday.

(Photo by BG023/Bauer-Griffin/GC Images)

Bethenny Frankel was all smiles while out and about in New York City on Tuesday.

(Photo by Robert Kamau/GC Images)

Christine Baranski was spotted at the Magic Radio studios to promote "Mamma Mia! Here We Go Again" in London on Tuesday.

(Photo by Neil Mockford/GC Images)

Miley Kunis rocked an oversized plaid pantsuit on Thursday in New York City.

(Photo by Gotham/GC Images)

Kelsea Ballerini flashed a smile while getting into her car in New York City after performing at the Amazon Music Unboxing Prime Day event on Wednesday night.

(Photo by MediaPunch/Bauer-Griffin/GC Images)

Tinashe was spotted out and about in Los Angeles on Thursday night.

(Photo by gotpap/Bauer-Griffin/GC Images)

Jessica Biel sported a ton of layers while out in London on Wednesday night. 

(Photo by Ricky Vigil/GC Images)

Katie Couric looked stoic while out for a while in New York City on Tuesday. 

(Photo by Robert Kamau/GC Images)

Nicky Hilton Rothschild stepped out for the launch of The Tot Pop Up store with Everafter in East Hampton over the weekend.

(Credit: Gregory Scaffaldi)

Heidi Klum kicks off Miami Swim Week wearing Greta Constantine during the Ocean Drive Magazine party with Heidi Klum Swim on July 12, 2018.

(Credit: StarTraks)

Riverdale's  Marisol Nichols spotted out and about enjoying a coffee on June 13 wearing a maxi dress by dressbarn.

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