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.
The Knight & Day star stood at the altar at a pal's 2006 nuptials in France. Should Diaz ever say "I Do!" she can count on BFF Drew Barrymore to show up. "Cameron's my best friend in the whole world and I'd be honored to be a bridesmaid," Barrymore has said.