Avril Lavigne performs 'Sk8er Boi' at Taylor Swift and Travis Kelce's MSG wedding

LOS ANGELES, CALIFORNIA: Taylor Swift and Travis Kelce's massive wedding is still the talk of the town, with fans eager to learn what happened behind the closed doors of Madison Square Garden. 

Because the couple enforced a strict no-phone policy, only a handful of details have emerged. However, new revelations continue to paint a picture of a star-studded celebration filled with surprise performances and unforgettable moments.

Avril Lavigne performs 'Sk8er Boi' at Taylor Swift and Travis Kelce's wedding

Sports commentator Pat McAfee, who attended the July 3 wedding, revealed on his daily show that pop-punk icon Avril Lavigne took the stage for a surprise performance of her 2002 hit 'Sk8er Boi.' McAfee described the performance as "awesome" and said the celebration evolved into an all-star live music jam session.

"Then, Paul McCartney played a song that he hasn't played since 1960-something for the first time ever," he said during 'The Pat McAfee Show' on July 13. "Stevie Nicks played, Taylor was up there with them—obviously. Avril Lavigne."

Two days later, McAfee acknowledged that he had accidentally broken the news.

"I guess yesterday me saying that Avril Lavigne played 'Sk8r Boi' was the first time that it came out," he quipped during a new episode of his show. 

"But she was awesome. To be clear, those musicians—really cool. One would just call out the other, and then they would come up, and then they would just do," he added.

McAfee also praised the celebration itself, calling it "the most spectacular grand thing I've ever seen in my entire life."

"Taylor Swift's one of the what the greatest creators that the world's ever seen. Think about her brain going to her dream wedding and then Travis Kelce's energy in the middle of it."

"They absolutely showcased that they are in love," McAfee shared, explaining how he always thought "Travis would be the perfect person for Taylor." He added, "Travis Kelce is very much in love, seems very happy."

Taylor Swift and Travis Kelce's wedding featured an all-star music lineup

Lavigne's surprise appearance was only one part of the wedding's impressive musical lineup.

According to McAfee, the biggest highlight came when Beatles legend Paul McCartney performed 'I Want to Hold Your Hand.' He said it marked the first time McCartney had performed the iconic hit live in more than 60 years. Following his performance, Stevie Nicks joined Swift onstage for a special duet.

The celebration continued with performances from Ice Spice and Tate McRae. Guests were also treated to appearances by Camila Cabello, Sombr, the Haim sisters, Ellie Goulding, and Benson Boone, turning Swift and Kelce's wedding reception into an unforgettable concert for friends and family.