T.I.

After getting a short snippet earlier this month, T.I. and Christina Aguilera's joint track Castle Walls has finally arrived in full. Produced by Alex da Kid, the same man behind Eminem's hit single Love the Way You Lie, the track opens with Christina crooning her lines through

Listen to T.I.'s full song 'Castle Walls' Feat Christina Aguilera below:

Almost at the same time, T.I. has also debuted a music video to promote his song I Can't Help It and keep himself visible while he is away to serve his jail time. This rapper keeps it simple in this clip, rapping to the camera with his featured guest Rocko.

Both Castle Walls and I Can't Help It are listed in T.I.'s next studio installment No Mercy which is due December 7 in the U.S. Although Can't Help It has got a music video treatment, it is Castle Walls which is considered to be the second single. Alex told MTV, It's going to be T.I.'s next single. I love it. I think it's amazing. It's my sound, just kind of an evolution of that. I think it'll cater to a lot of different people.