Amy Adams vs. Christie Brinkley both in Roland Mouret

Rooney Mara vs. Anne Hathaway both in Givenchy

Ashlee Simpson vs. Catherine Zeta-Jones both in Alice + Olivia 

Brandy vs. Kelly Pickler both in Herve Leger 

Jennifer Lopez vs. Victoria Beckham both in Victoria Beckham...this is a tough one! 

Jennifer Morrison vs. Nicole Scherzinger both in Bill Blass 

Zooey Deschanel vs. Olivia Munn both in Rachel Zoe Collection