Celebrities who celebrate birthdays in December

Slideshow posted in Photos | Wednesday, December 05, 2012

64 of 77: Sienna Miller turns 31 on Dec. 28, 2012. The actress is known for her roles in films such as 'Casanova,' 'Alfie,' 'Stardust' and 'Factory Girl.'

Pictured: Sienna Miller appears as Tippi Hedren in a still from the 2012 HBO film, 'The Girl.' (HBO / Justin Polkey)