Christina Aguilera teamed up with T.I. for a new song called "Castle Walls" off of the rapper's new album No Mercy and we have to say, we're loving it!
The song was produced by Alex da Kid (who's also behind Eminem and Rihanna's smash hit, "Love the Way You Lie") and has real potential to be the break out song that Xtina and T.I. need after a year where both saw lackluster sales.
Listen to the song below and tell us: