Alex Da Kid is on fire. After producing Eminem and Rihanna’s No. 1 smash “Love the Way You Lie” and Dr. Dre’s new Detox record with Em, “I Need a Doctor,” the London producer has another big collabo lined up.

“Castle Walls” will be the next single from T.I.’s seventh album No Mercy featuring Christina Aguilera. The hitmaker tells Rap-Up TV how he stalked Tip in L.A. to get him to do the song and how Christina came into the picture. A video was shot before the rapper returned to prison.

“It’s hip-hop, it’s electro, but I think it’s gonna lend itself to a broad audience,” he explains. “It has some kind of substance to it in the lyrics. It should work on radio and in the club, hopefully.”

Source: Rap-Up