“‘NOBODY COULD BELIEVE THEIR EYES!’ PAUL McCARTNEY STUNS TAYLOR SWIFT AND TRAVIS KELCE’S WEDDING BY PERFORMING A BELOVED BEATLES CLASSIC — THEN STEVIE NICKS DELIVERS A MOMENT THAT LEAVES 1,000 GUESTS IN TEARS”!What was already being called the celebrity wedding of the decade reportedly turned into something even more extraordinary when music royalty took over the stage.

Paul McCartney brought a little Beatles mania to Taylor Swift and Travis Kelce’s wedding.

The musician, 84, performed the band’s No. 1 hit “I Want to Hold Your Hand” at the couple’s star-studded reception at Madison Square Garden in New York City on Friday, July 3, a source confirms exclusively to PEOPLE.

“After the ceremony, Taylor’s mom Andrea invited everyone into the reception room where the stage was set up,” says the source, who adds that Stevie Nicks — who has been a friend and mentor to Swift for years — also performed.

Reps for Swift, McCartney and Nicks have not responded to requests for comment from PEOPLE.

Swift, 36, and McCartney, meanwhile, have made no secret of their mutual admiration for each other. They previously appeared on the cover of Rolling Stone together in 2020.

More recently, Swift reshared an Instagram post from the legendary British singer about his new album, The Boys of Dungeon Lane. Alongside the post on June 2, she praised McCartney as an “eternally exceptional artist” and said she was “never not inspired” by him.

Her post came days after the Beatles star was asked during an interview if he would give Swift any advice on navigating the same level of global fame he has achieved in his own music career.

“You do see the parallel, you know the fame and the amount of fame,” McCartney said in a conversation with BBC Sounds.

“The worldwide fame that Taylor Swift has and that we had, but I don’t think she needs any advice to tell you the truth,” he continued with a laugh.

McCartney later reiterated that if Swift asked him for advice, he would “definitely” oblige.

“I’m like the older brother to that generation, or more like the grandad, actually,” he said.

The “Coming Up” singer revealed that he met Swift, along with other young singers, including Billie Eilish, Olivia Rodrigo and Sabrina Carpenter, at parties hosted by his wife, Nancy Shevell, and daughter, Stella McCartney.

“They’re really cool people, they’re very good,” he told BBC Sounds of the singers.

“I like their voices,” he added. “If they need any advice, yeah, I would be happy to give it, but I don’t think they do.”

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McCartney was spotted at one of Swift’s Eras Tour shows at Wembley Stadium in London in June 2024, just days after celebrating his 82nd birthday. He was seen being greeted by fans — and being gifted several friendship bracelets in an Eras Tour tradition — on his way to his seat at the venue.

Swift returned the favor two years later, attending McCartney’s intimate concert at the Fonda Theatre in Los Angeles on March 28.