Video: Jessica Simpson - These Boots Are Made For Walkin'

It's pretty much a given that casting a musician in your movie guarantees they'll contribute to the film's soundtrack—and if you're lucky, you'll have a hit song to help promote your flick. The most recent example is Taylor Swift's "Today Was a Fairytale," the lead single off the soundtrack to Valentine's Day . The song was on iTunes for a matter of hours before it already hit #1 . (As for the fate of the movie? It has to compete with The Wolfman V-Day weekend, so we'll see whether America is in the mood [...]