Billboard Bits serves up the best bite-sized nuggets of music news and gossip.

Justin Bieber Named One of Barbara Walters' '10 Most Fascinating People'

Justin Bieber was one of the 10 people to make it on Barbara Walters' annual "Most Fascinating People" list. He joins other A-List celebrities like Jennifer Lopez and Sandra Bullock as well as Sarah Palin and the cast of the Jersey Shore. Walters' full list will be announced during a televised special, which airs on ABC on Dec. 9. (People)

T.I.-Christina Aguilera Collaboration Hits Net

"Castle Walls," a new collaboration between T.I. and Christina Aguilera, has debuted online in anticipation of the rapper's forthcoming album "No Mercy." Aguilera's hook on the Alex Da Kid-produced cut may be a subtle reference to T.I.'s extended jail time: "If I should tumble, if I should fall/Would anyone hear me, screaming behind these castle walls?" ( MTV)

Michael Buble Announces Wedding Date

Michael Buble has announced that he and Luisana Lopilato will tie the know on April 6, 2011. The Canadian singer, who announced the nuptials on the "Today" show earlier today, was previously engaged to actress Emily Blunt. ( Us) 

Paul McCartney's Daughter, Stella, Welcomes Baby Girl

Fashion designer/Paul McCartney's daughter Stella McCartney gave birth to a baby girl on Nov. 23. The new baby, Reiley, is McCartney's fourth child. Stella will take a limited maternity leave before returning to work on her upcoming fashion line for Adidas. (Popeater)

Wolf Parade Announces Indefinite Hiatus

After releasing third album "Expo 86" earlier this year, Canadian indie band Wolf Parade has announced that it will go on indefinite hiatus. Co-front man Spencer Krug told an Ontario audience on Friday night (Nov. 26) that the performance would be the last show for the band in the foreseeable future. ( Spinner)

The xx Member Remixes Gil-Scott Heron

The xx beatmaker Jamie Smith has been tapped to contribute to "We're New Here," a remix album inspired by Gil Scott-Heron's latest album "I'm New Here." The album, due out Feb. 22, 2011, will include Smith's take on the track "New York is Killing Me." ( Pitchfork)

(Reporting by Jason Lipshutz and Megan Vick)