Last night after the Teen Choice Awards, Zac Efron headed over to the Hollywood Bowl to see his girlfriend Vanessa perform in her final night as Mimi, an HIV club-dancer, in RENT.

We didn't know the show encouraged audience participation, but during one Vanessa's numbers where she shook her stuff in front of the crowd, Zac leaned over and tipped her a twenty!

Zac recently said that his relationship with longtime girlfriend Vanessa is "exactly how it should be. It’s real," Efron says.

Real spicy, that is!