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Mos Def: December 11 - The rapper and actor, who now goes by Yasiin Bey, celebrates his 40th birthday this week. (Photo: Johnny Nunez/WireImage)

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Raven-Symonè: December 10 - The star of The Cosby Show and That's So Raven!, who came out earlier this year, turns 28. (Photo: Michael Kovac/Getty Images for Louis XIII)

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Teyana Taylor: December 10 - The G.O.O.D. Music artist from Harlem turns 23 this week. (Photo: Mike Coppola/Getty Images for Moet Rose)

Photo By Photo: Mike Coppola/Getty Images for Moet Rose

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Jermaine Jackson: December 11 - MJ's little bro, who managed to escape jail time over failure to pay his child support, is 59. (Photo: Chris Jackson/Getty Images)

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Mo'Nique: December 11 - The Academy Award winner, who has never looked better thanks to a dedicated fitness regime, celebrates her 46th birthday. (Photo: Kevin Winter/Getty Images)

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John Kerry: December 11 - The U.S. Secretary of State turns 70 this year. (Photo: Slaven Vlasic/Getty Images)

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Dionne Warwick: December 12 - The chart-topping singer celebrates her 73rd birthday. (Photo: Dimitrios Kambouris/Getty Images)

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Sheila E.: December 12 - Prince's one-time muse and drummer extraordinaire turns 56. (Photo: Jason Kempin/BET/Getty Images for BET)

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Regina Hall: December 12 - The Best Man Holiday star celebrates her 43rd birthday. (Photo: Jason Merritt/BET/Getty Images for BET)

Photo By Photo by Jason Merritt/BET/Getty Images for BET

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Morris Day: December 13 - The lead singer of the Time turns 56. (Photo: Stephen Lovekin/Getty Images)

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Jamie Foxx: December 13 - The Oscar-winning actor and sometimes-rapper is 46. (Photo: Valerie Macon/Getty Images)