From Adele to Bill Nye the Science Guy: See All the Stars Flocking to Taylor Swift's Reputation Stadium Tour

"So proud of my girl," the Broadway star wrote on Instagram.

"Such a fun night," the teen captioned his photo with Swift on Instagram.

David and Victoria Beckham's son called Swift "so inspirational" after striking a pose with her backstage.

"Ended the week celebrating a #1 record with the incredible @taylorswift," wrote the Backstreet Boy.

The trio posed for an epic selfie with Swift at the Rose Bowl.

The Girls star planted a smooch on her longtime BFF.

Swift's longtime model pal posed for a cute photo backstage at the Rose Bowl with stylist Ashley Avignone and opener Camila Cabello.

Adele — who attended a Rose Bowl show — hit up Swift's U.K. show along with Harry Potter author J.K. Rowling.

The director was spotted in the audience with his wife Leslie Mann.

"Thank you @taylorswift for your generosity and kindness," the actress wrote on Instagram.

The actor visited the singer and posed for a series of silly selfies backstage alongside his pal Dave Osokow.

"Rude not to," captioned the fashion designer.

"Thanks for teaching us about science and being the coolest," Swift wrote on her Instagram Stories.

It's tradition! Gomez returned to the stage with Swift at her Rose Bowl stop.

Mendes previously opened for Swift on her 1989 tour and returned at the Rose Bowl in May.

He was spotted in the crowd earlier in the night and then hit the stage to perform "Slow Hands" with Swift.

The singing legend performed "Angels" with the Grammy winner at Wembley Stadium.

“She is the real deal. This girl deserves all her success,” Pratt said after Swift surprised his family with tickets and a meet-and-greet.

"Thank you to the incredible @taylorswift for being so kind to Charlotte," Gellar wrote on Instagram about her daughter. "She was so in awe, she could barely speak."

The actress shared a selfie with Roberts and Rose from Swift's Rep Room.