Cue the chiffon! Even celebs lend their help to pals and siblings when it comes to their big day. Take a look at these A-listers who served as bridesmaids in the past. Everyone from Jessica Simpson to Britney Spears have taken on the role.
She headlined 27 Dresses, but off-screen the actress (who wed musician Josh Kelley in December 2007) was a bridesmaid at her sister Meg's wedding in October 2006. "I haven't yet had to wear a terrible bridesmaid dress," Heigl has said. "My sister was very considerate about her bridesmaid dresses."