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You didn't think Zac Efron would stick to the status quo for Adam DeVine, did you?

In honor of his close friend and co-star's birthday, the former High School Musical star took to Twitter Monday afternoon for a surprise performance.

Ladies and gentlemen, prepare your ears for the sweet sounds of Mr. Efron.

"Happy Birthday to one hell of a sexy dude," he sang while wearing a black beanie and matching T-shirt. "Oh, Happy Birthday to one hell of a cool dude."

But wait, there's more. "Oh I said Happy Birthday Adam Devine, because you're the best, the best, the coolest of a f--king dude," Zac added.

Adam DeVine, Zac Efron

Gregg DeGuire/Getty Images

Did we mention he also played the piano during this performance? Ladies, you now have permission to swoon.

For those unaware of Zac and Adam's bromance, where have you been let us explain.

The Hollywood actors grew close on the set of Mike and Dave Need Wedding Dates. Since then, the pair have enjoyed piggy back rides on red carpets, shared each other's trainers and even experienced an on-screen kiss.

As for Zac's signing voice, we may be able to hear it again when he joins Hugh Jackman in The Greatest Showman.

20th Century Fox's latest musical focuses on P.T. Barnum (Hugh) who happens to be the founder of the traveling Ringling Bros. and Barnum & Bailey Circus. Zac also joins Michelle Williams and Zendaya in the film tentatively scheduled for a Christmas 2017 release date.