WATCH: ZAC EFRON Will Make You Swoon With His Birthday Song For ADAM DEVINE!

Zac Efron went back to his High School Musical roots to greet his Mike and Dave Need Wedding Dates co-star Adam Devine on his 33rd birthday!

LOOK: ZAC EFRON Finally Reunites With "High School Musical" Co-Stars!

"Happy birthday to one hell of a sexy dude. Oh happy birthday to one hell of a cool dude. Oh, I said happy birthday Adam Devine because you're the best, the best, the coolest f**king dude," belts the 29-year-old HSM alum accompanied by a blues piano riff. Check out his Twitter post below:

Should Zac pursue a music career? Tell us in the comments!