ROONEY MARA, 28

HOT
Wearing a Lanvin gown to the Oxfam Charity Gala in Dubai on Dec 11

This was one of the rare occasions when the word "sexy" could have been used to describe Mara - who normally turns up in more edgy-looking outfits. The streamlined one-shoulder gown shows off her svelte figure and a more ladylike side to her tough-girl image.

NOT
Wearing a Givenchy coat to the premiere of the movie Her in Los Angeles on Dec 12

The boxy black coat dress did nothing for Mara except make her look small and frail.

The strappy Givenchy heels look odd here, given the wintery vibe of the rest of her outfit. She appears like a woman in mourning.