Celebrity birthdays in May

Slideshow posted in Photos | Monday, May 14, 2012

21 of 131: Vincent Kartheiser turns 33 on May 5, 2012. The actor is known for his role as Pete Campbell in the hit TV show, 'Mad Men.' He's also known for 'Angel' and films such as 'Alpha Dog' and 'Alaska' (1996). ( Photo / Lionsgate Television)

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