"What was Harry Connick Jr.'s first movie?"

For every actor with rock star dreams (we're talking to you, Billy Bob Thornton), there are a dozen pop stars who want to try their hand at acting. J. Lo and Harry Connick Jr. are two with some movie successes under their belts ... and Jessica Simpson? Well, she's trying.

Take our quiz on 18 musicians turned thespians, and see if you can add "pop culture expert" to your own bag of tricks.