The 29-year-old actor decided to pen an original song for Adam and took to his Instagram to share it with the world…and show off his #pianoskills!
“Happy birthday to one hell of a sexy dude…Cause you’re the best, the coolest mother f***king dude!” Zac hilariously sang.
In the caption he added, “Happy Birthday @andybovine. This one is for you. #PianoSkills.”
Check out the full performance below…