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Lady GaGa: March 28 - Pop star Lady GaGa celebrates her 25th birthday.(Photo credit: Fafotos/Elevation/PictureGroup)

Photo By Fafotos/Elevation/PictureGroup

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MC Hammer: March 30 - MC Hammer turns 49.(Photo credit: Lucas Dawson/Getty Images)

Photo By Photo credit: Lucas Dawson/Getty Images

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Norah Jones: March 30 - Singer Norah Jones celebrates her 32nd birthday.(Photo credit: Darren Hauck/Getty Images)

Photo By Photo credit: Darren Hauck/Getty Images

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Tracy Chapman: March 30 - Singer-songwriter Tracy Chapman turns 47.(Photo credit: John Spellman/Retna Ltd.)

Photo By Photo credit: John Spellman/Retna Ltd.

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Celine Dion: March 30 - Singer Celine Dion celebrates her 43rd birthday.(Photo credit: Kevork Djansezian/Getty Images)

Photo By Photo credit: Kevork Djansezian/Getty Images

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Al Gore: March 31 - Former Vice President Al Gore turns 63.(Photo credit: Frazer Harrison/Getty Images)

Photo By Photo credit: Frazer Harrison/Getty Images

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Susan Boyle: April 1 - Singer Susan Boyle celebrates her 48th birthday.(Photo credit: Dave J Hogan/Getty Images)

Photo By Photo: Dave J Hogan/Getty Images

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Rachel Maddow: April 1 - MSNBC anchor Rachel Maddow turns 38.(Photo credit: Boston Globe/John Tlumacki/Landov)

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Yung Joc: April 2 - Rapper Yung Joc celebrates his 27th birthday.(Photo credit: REUTERS/Mike Blake /Landov)

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Rodney King: April 2 - Rodney King turns 46.(Photo credit: Scott Weiner/Retna Ltd.)

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Adam Rodriguez: April 2 - Actor Adam Rodriguez celebrates his 36th birthday.(Photo credit: Stephen Lovekin/Getty Images)

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Eddie Murphy: April 3 - Academy Award–nominated actor and comedian Eddie Murphy turns 50.(Photo credit: Dimitrios Kambouris/Getty Images)

Photo By Dimitrios Kambouris/Getty Images

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Aries Spears: April 3 - Comedian Aries Spears celebrates his 36th birthday.(Photo credit: Roger Walsh/Landov)

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Leona Lewis: April 3 - The singer turns 26.(Photo credit: Jason Merritt/Getty Images)