Buzz Bites (3/3/11): Could Ke$ha-Penned ''Til The World Ends' Be Britney Spears' Next Single?

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+ Britney Spears' new single will reportedly be released to radio next week and rumor has it the track could be "'Til The World Ends," which happens to have been written by Ke$ha. (MTV News)

+ Christina Aguilera, dusting herself off after her run in with the law this week, has landed a gig judging contestants on the new vocal talent show "The Voice." (Celebuzz)

+ U.K. tabloids are reporting that Jay-Z is worried about Rihanna's punishing schedule. (PopEater)

+ Wiz Khalifa is on the cover of Rolling Stone's 2011 Hot List issue. (Idolator)

+ We mentioned before that Justin Bieber had donated his hair to be auctioned off by Ellen DeGeneres. Well someone paid $40k for the Bieber lock. Proceeds go to the Gentle Barn Foundation. (TheFABlife)

+ Miley Cyrus is hosting this week's "Saturday Night Live," with musical guest The Strokes. Check out her funny promos for the show, below.