Infant Sorrow features in the 2010 film Get Him to the Greek starring Russell Brand as rock singer Aldous Snow. The story revolves around Aldous and his record company minder. The other band members don't feature as characters, merely backing musicians. They are a pretty good band though and some of the songs are catchy as heck.
Aldous Snow first appeared in the 2008 comedy film Forgetting Sarah Marshall as the Sarah Marshall's new boyfriend, a big star douchey eco-singer who's really using the schtick to get laid.