Billie Joe mentioned
Post-“Gossip Girl,” Meester relocated to Los Angeles, married “The OC” actor Adam Brody, and returned to making movies, including the upcoming “Like Sunday, Like Rain” with Green Day’s Billie Joe Armstrong.
“He is one of the nicest, most centered people I’ve ever met, and he plays my ex-boyfriend, who’s a sign of my immature past,” she says of her co-star, adding that they never once discussed songwriting on set. “We talked about acting instead, because he is quite good!”
http://www.sfexaminer.com/sanfrancisco/leighton-meester-moves-back-to-music/Content?oid=2921911