Lady Gaga Plants A Wet One On Green Day’s Billie Joe Armstrong

After making all her New York-based little monsters go hoarse from screaming at her five sold-out shows at Madison Square Garden, Lady Gaga focused on entertaining herself for a change, catching a show of American Idiot last night. The pop star capped off her evening by smooching a “Bravo!” on the cheek of Green Day frontman Billie Joe Armstrong (who happened to be one little monster in attendance at Gaga’s concert). Check out Gaga hanging backstage with the cast of the Grammy-winning B’way show over at MTV Buzzworthy. Also: duet, you two!