Zac Efron and Adam DeVine's bromance is still going strong, and we can't get enough. On Monday, the Baywatch actor wished his Mike and Dave Need Wedding Dates costar a happy 33rd birthday with a hilarious video on Instagram. "Happy birthday to one hell of a sexy dude," he sang while jamming out on the piano. "Oh, happy birthday to one hell of a cool dude." And it seems that Zac is only just starting to warm up his vocal chords again. After being thrust into the spotlight for his role as Troy in Disney Channel's High School Musical franchise, he's set to go back to his singing roots when he stars alongside Hugh Jackman in Fox's musical The Greatest Showman On Earth in December 2017.