See Zac Efron Sing an Original Birthday Song for ‘Sexy Dude’ Adam Devine

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Photo: Axelle/Bauer-Griffin/FilmMagic

Most onscreen sibling relationships end after the filming wraps, but the brotherly bond persists for the stars of Mike and Dave Need Wedding Dates. Zac Efron has so embraced Adam Devine as his bro that he created his own birthday song with which to serenade his fellow actor over Twitter. In the video, the High School Musical former teen idol plays piano and sings, "Happy Birthday to one hell of a sexy dude. Oh, Happy Birthday to one hell of a cool dude." So, Devine, now it's time you use those Pitch Perfect pipes and return the favor with your own "funky fresh" response tune. We suggest starting with a few bars about Efron's eyes.