Listen up, Music Fans: We’re finally getting our first listen to the highly-anticipated collaboration between embattled rap star T.I. and newly-single singer Christina Aguilera. The song — titled “Castle Walls” — was produced by Alex Da Kid, the music mastermind behind Rihanna & Eminem’s smash hit “Love The Way You Lie” and “Airplanes” from B.o.B. and Hayley Williams from Paramore.

Rock It or Drop It?

“Castle Walls” is featured on T.I.’s forthcoming disc, No Mercy, set to hit music retailers and iTunes on Dec. 7. Of course, the self-dubbed “King of the South” won’t be available to kiss any babies or host an album release party. The rap star is still in the first few weeks of his 11-month stay in federal prison following a probation violation.

Dallas Austin, the producer famous for fathering TLC’s Chilli’s “crotchfruit,” has called out blue-eyed soul singers Christina Aguilera and Joss Stone for boning producers in exchange for hot tracks.

Dallas Austin Talking About Christina

“Christina Aguilera, Joss Stone… all these bitches be fuckin’ for tracks,” says the Grammy Award winning producer in the video. “You go in the studio with the regular girls like Ciara and them, they just want to get their work done. Fuck all these bitches fuckin’ for tracks.”

Christina Aguilera celebrated her Las Vegas concert with an after-party at Pure in Caesar’s Palace on Saturday night.