Taylor Swift surprised Reputation Tour attendees last by bringing out one very special guest: Bryan Adams!

The two rocked out to his 1985 hit "Summer of '69" at Rogers Centre in Toronto.

"I didn't even know Bryan was gonna be in town until last night and I asked him completely last minute if he wanted to come sing!! Pretty evident from the videos (um yes I'm posting another one) that I'm FULLY LOSING IT with excitement, and I can't thank @bryanadams enough," Swift wrote on Instagram. "HONESTLY IT WAS JUST SO MUCH FUN!"

Taylor Swift, Hayley Kiyoko

Kevin Mazur/TAS18/Getty Images for TAS

Adams is the latest special guest after Hayley Kiyoko, who joined Swift in concert late last month.

The two singers performed Kiyoko's song "Curious" from her debut album Expectations in front of an excited crowd at Gillette Stadium in Foxborough, Mass.

Kiyoko later thanked Swift for inviting her on stage.

"It's really hard to put into words how I feel and what just happened," she wrote on Instagram alongside a photo of Swift. "I feel overwhelmed. Taylor, you reached out to someone who dreams of being heard and understood. Thank you for giving me one of the biggest gifts of my life, opportunity. And thank you for showing me that these crazy dreams of mine are possible. I couldn't be more grateful. We keep climbing :)." 

To look back on all of Swift's collaborations from this tour, check out the videos.

Bryan Adams

The duo strummed their guitars and sang their hearts out to Adams' classic "Summer of '69" at Rogers Centre in Toronto.

Hayley Kiyoko

Swift and Kiyoko performed "Curious" from Kiyoko's debut album Expectations during Swift's stop at Gillette Stadium in Foxborough, Mass.

Robbie Williams

Swift and the "Feel" singer performed his hit "Angels" at Wembley Stadium in London.

 

Niall Horan

The former One Direction singer took the Wembley Stadium stage on a different night to perform his song "Slow Hands" with the "Delicate" singer.

Troye Sivan

Sivan joined Swift on stage at the Rose Bowl in Pasadena, Calif. to perform his hit "My My My!"

Selena Gomez

However, Sivan wasn't Swift's only surprise guest that evening. She also brought out her best pal Gomez to sing "Hands to Myself."

Shawn Mendes

In fact, Swift was full of surprises in Pasadena. Just the night before, Mendes joined Swift on stage to perform "There's Nothing Holdin' Me Back." 

Camila Cabello and Charli XCX

Of course, every night Swift has Cabello and Charli XCX join her on stage for "Shake It Off." Both stars are openers for Swift's tour.

We can't wait to see who she brings out next!

(Originally published on Friday, July 27, 2018, at 9:18 a.m. PDT.)

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