Green Day frontman Billie Joe Armstrong is set to make his major movie debut as actress Leighton Meester's boyfriend. The American Idiot hitmaker will play the Gossip Girl star's lover in Like Sunday, Like Rain, according to Deadline.com. The movie follows the story of a struggling musician (Meester), who suddenly becomes the guardian of a musical prodigy. Armstrong has made a few small cameos in films such as Riding in Cars With Boys, and he played himself in comedy This is 40 - but the scene was deleted from the final cut. He has also tasted Broadway success with brief stints in his American Idiot stageshow.