Sienna Miller’s Sexiest Looks (PHOTOS)

It’s a big day today for Sienna Miller, as the drop-dead gorgeous actress is celebrating her 29th birthday.

The G.I. Joe starlet has often made headlines thanks to her off-screen activities, but Celebuzz is all about celebrating the positive. When there’s a red carpet, few can top the beauty of Miss Miller. Whether she’s rocking a pixie cut or long, flowing blonde locks, Sienna knows how to work it in a wide array of styles.

Take a look at Sienna’s sexiest outings! Then, tell us in the comments: Where do you think Sienna ranks among Hollywood’s top beauties?