Last Night's Look: Love It or Leave It?Check out the head-turning outfits Kristen Stewart, Jennifer Aniston and more stars were just spotted in! Then decide – fabulous or fashion fail!

JENNIFER ANISTON

It was so nice of Kelly (or was it Brenda?) to lend Jen her prom dress. All the actress had to do was make a few modifications to the Valentino creation and add her favorite clutch (also Valentino) and the frock was perfect for a Beverly Hills tribute to Ben Stiller. She finishes the look with Fred Leighton jewelry.