@officialadele / Instagram 1 / 10
@officialadele / Instagram 1 / 10

When musical powerhouses collide! The ever-elusive Adele came out of her reclusive state on May 27 to see the legendary Stevie Nicks and Fleetwood Mac perform in London.

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In a rare public appearance, Adele took in the iconic band's show at the O2 Arena and was able to fangirl out a bit when she met the frontwoman of Fleetwood Mac.

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"So...tonight was THE best night of my life," the "Rolling in the Deep" singer tweeted. "I love you Stevie Nicks!! The queen of melodies! Thanks for everything x."

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According to UK's NME magazine, Stevie gave Adele a special shout out during the show and told the crowd the British singer was in the house.

"I told her, 'You're going to be me in 40 years,'" Stevie reportedly said on stage. "'You're going to still be up onstage doing what you're doing because of your songwriting.'" Stevie then dedicated her performance of the 1970s classic "Landslide" to Adele.

Florence Welch of Florence and the Machine was also at the show.