Taylor Swift is 'fully losing it' while performing 'Summer of '69' with Bryan Adams -- Watch!

Taylor Swift's list of guest celebrity performers for her Reputation tour shows just keeps getting better and better!

The 28-year-old singer surprised the crowd at Rogers Centre in Toronto, Canada, on Saturday, when she brought out Bryan Adams for a spirited rendition of his 1985 classic, "Summer of '69."

Following the show, Swift took to Instagram to marvel over the incredible performance, revealing to her fans that the collaboration actually happened at the last minute.

"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!!" she explained. "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 ✨⭐️💫."

"HONESTLY IT WAS JUST SO MUCH FUN 💥🌸🌷🌲☀️⭐️✨🥂🎤🎼🎸🎆🎁🎉🎀," she added. "@bryanadams is so [cool]."

Adams seemed to be equally thrilled with how the night went, sharing a series of selfies and videos he took with Swift to his own Instagram account.

"Sang with the gorgeous @taylorswift tonight in #toronto ...what a treat," he captioned one of the posts. "Thanks Taylor!"

"My photo of @taylorswift showing me the under-stage slide to the trap door," another post read. "Thanks Taylor, I’m not sure I’d have gone that way if ya hadn’t shown me! #taylorswift #fendertelecaster."

Late last month, Swift's show at MetLife Stadium in East Rutherford, New Jersey, didn't run as smoothly. The singer accidentally took a tumble while performing "Call It What You Want."

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Taylor Swift's Reputation Stadium Tour
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Taylor Swift's Reputation Stadium Tour
GLENDALE, AZ - MAY 08: Taylor Swift performs onstage during opening night of her 2018 reputation Stadium Tour at University of Phoenix Stadium on May 8, 2018 in Glendale, Arizona. (Photo by Kevin Mazur/Getty Images for TAS)
GLENDALE, AZ - MAY 08: Taylor Swift performs onstage during opening night of her 2018 reputation Stadium Tour at University of Phoenix Stadium on May 8, 2018 in Glendale, Arizona. (Photo by Kevin Winter/Getty Images for TAS)
GLENDALE, AZ - MAY 08: (L-R) Camila Cabello, Taylor Swift, and Charli XCX pose onstage before opening night of Taylor Swift's 2018 Reputation Stadium Tour at University of Phoenix Stadium on May 8, 2018 in Glendale, Arizona. (Photo by Christopher Polk/Getty Images for TAS)
GLENDALE, AZ - MAY 08: Taylor Swift performs onstage during opening night of her 2018 reputation Stadium Tour at University of Phoenix Stadium on May 8, 2018 in Glendale, Arizona. (Photo by Kevin Winter/Getty Images for TAS)
GLENDALE, AZ - MAY 08: Charli XCX, Camila Cabello and Taylor Swift perform onstage during opening night of Taylor Swift's 2018 reputation Stadium Tour at University of Phoenix Stadium on May 8, 2018 in Glendale, Arizona. (Photo by Christopher Polk/Getty Images for TAS)
GLENDALE, AZ - MAY 08: Taylor Swift performs onstage during opening night of her 2018 reputation Stadium Tour at University of Phoenix Stadium on May 8, 2018 in Glendale, Arizona. (Photo by Christopher Polk/Getty Images for TAS)
PASADENA, CA - MAY 19: Taylor Swift performs onstage during the Taylor Swift reputation Stadium Tour at the Rose Bowl on May 19, 2018 in Pasadena, California (Photo by Christopher Polk/TAS18/Getty Images)
PASADENA, CA - MAY 19: Charli XCX, Camila Cabello and Taylor Swift perform onstage during the Taylor Swift reputation Stadium Tour at the Rose Bowl on May 19, 2018 in Pasadena, California (Photo by Christopher Polk/TAS18/Getty Images)
PASADENA, CA - MAY 19: Taylor Swift performs onstage during the Taylor Swift reputation Stadium Tour at the Rose Bowl on May 19, 2018 in Pasadena, California (Photo by Christopher Polk/TAS18/Getty Images)
PASADENA, CA - MAY 19: Selena Gomez and Taylor Swift perform onstage during the Taylor Swift reputation Stadium Tour at the Rose Bowl on May 19, 2018 in Pasadena, California (Photo by Christopher Polk/TAS18/Getty Images)
PASADENA, CA - MAY 19: Taylor Swift and Troye Sivan perform onstage during the Taylor Swift reputation Stadium Tour at the Rose Bowl on May 19, 2018 in Pasadena, California (Photo by Christopher Polk/TAS18/Getty Images)
PASADENA, CA - MAY 18: Taylor Swift performs onstage during the Taylor Swift reputation Stadium Tour at the Rose Bowl on May 18, 2018 in Pasadena, California (Photo by Christopher Polk/TAS18/Getty Images)
PASADENA, CA - MAY 18: Taylor Swift and Shawn Mendes perform onstage during the Taylor Swift reputation Stadium Tour at the Rose Bowl on May 18, 2018 in Pasadena, California. (Photo by Kevin Mazur/TAS18/Getty Images)
SANTA CLARA, CA - MAY 11: Taylor Swift performs onstage during Taylor Swift reputation Stadium Tour at Levi's Stadium on May 11, 2018 in Santa Clara, California. (Photo by Kevin Mazur/TAS18/Getty Images)
GLENDALE, AZ - MAY 08: Taylor Swift performs onstage during opening night of her 2018 reputation Stadium Tour at University of Phoenix Stadium on May 8, 2018 in Glendale, Arizona. (Photo by Kevin Winter/Getty Images for TAS)
SANTA CLARA, CA - MAY 11: (L-R) Charli XCX, Taylor Swift, and Camila Cabello perform onstage during Taylor Swift reputation Stadium Tour at Levi's Stadium on May 11, 2018 in Santa Clara, California. (Photo by Kevin Mazur/TAS18/Getty Images)
SANTA CLARA, CA - MAY 11: Taylor Swift high-fives fans during Taylor Swift reputation Stadium Tour at Levi's Stadium on May 11, 2018 in Santa Clara, California. (Photo by Kevin Mazur/TAS18/Getty Images)
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