Celebrities who celebrate birthdays in December

Slideshow posted in Photos | Wednesday, December 05, 2012

18 of 77: Kara DioGuardi turns 42 on Dec. 9, 2012. The singer-songwriter and record producer is perhaps best known in the spotlight for her stint as a judge on the popular talent series 'American Idol.'

Pictured: Kara DioGuardi of 'American Idol' talks to OnTheRedCarpet.com in Los Angeles in April 2011. (OTRC Photo)