Who Sucks More?

Up until now Paris Hilton and Kevin Federline were famous for simply being famous (that's what a well-distributed sex tape and marrying Britney Spears will do). But now the two "stars" are looking to gain notoriety a new way -- through music.
We know they're good at having their pictures taken, but can they sing/rap?
Take a look at the two videos below and then decide for yourself: who sucks more?