Sir Paul McCartney reportedly serenaded newlyweds Taylor Swift and Travis Kelce with 1963 Beatles hit “I Want to Hold Your Hand” at their Madison Square Garden reception Friday evening.

A source for People confirmed the performance by the legendary singer on Saturday, saying, “After the ceremony, Taylor’s mom Andrea invited everyone into the reception room where the stage was set up.”

The Grammy winner’s longtime pal, Fleetwood Mac singer Stevie Knicks, was also said to have performed at the star-studded extravaganza, which stretched into the early morning hours Saturday.

Page Six previously exclusively reported ahead of the nuptials that Knicks and Tim McGraw would entertain guests at the massive soirée.

Reps for McCartney and Swift did not immediately respond to Page Six’s requests for comment Saturday. 

McCartney and Swift have been friends for years, and once appeared on the cover of Rolling Stone together.

The “Blank Space” hitmaker and NFL star, both 36, summoned a list of 1,000 guests — both A-list celebrities and close family members alike — to celebrate their union at an extravagant celebration at the New York City arena Friday.

A more intimate rehearsal dinner at the same venue Thursday evening was held for 100 members of the couple’s inner circle — including fellow songstress Selena Gomez, sports reporter Erin Andrews, Kelce’s pal Ross Travis and Swift’s longtime publicist, Tree Paine.

Following Friday’s massive bash, signs outside Madison Square Garden read “JUST&T MARRIED” to announce the news that the power couple had finally made things official.

The Empire State Building spires showcased a blue light show, acting as the “Opalite” singer’s “something blue.

A press release subsequently revealed Swift and Kelce wore Christian Dior Haute Couture to exchange vows, that comedian Adam Sandler officiated, and that Swift opted to enlist brother Austin Swift as her “Man of Honor,” while Travis enlisted his own brother, Jason Kelce, as “Best Man.”

After the blowout celebration, stars gushed over the experience on social media — including AMC Theatres CEO Adam Aron, who took to X with a since-deleted play-by-play account of the experience.

Here’s latest on Taylor Swift and Travis Kelce’s wedding at MSG:

Aron divulged in the post that MSG was “magically” transformed into “an outdoor garden at a lush countryside retreat.”

He wrote that the couple’s vows were “long, entertaining, personal, charming, emotional, irreverent and endearing explorations by each as to how they met, why they want to be with each other for all eternity, the promises they made in joining their much-beloved two whole families as one, and committing to their new mutual life together.”

The moment was followed by a “sweep you off your feet kiss,” he elaborated. During the “exquisite” reception, Aron shared that there was “superb food and drink” and “music, music, music.”

He added, “I wish you were all could have been there with me, to witness real, pure, true joy.”