ALLISON WILLIAMS, 26

HOT
Wearing a Christian Dior dress to the season 3 premiere of Girls in New York City last week

Just like her difficult, high-strung character Marnie from the HBO series Girls, her stuffy off-screen wardrobe has been hard to like. This is totally different. Here, she exudes girlish charm in a satin floral applique dress - a perfect look from head to toe.

NOT
Wearing a Calvin Klein dress to W Magazine's Best Performances celebration in Los Angeles last week

Not one of Williams' best fashion moments. The dress seemed a little too sombre and made her look completely washed out. The tweed material also seemed a little overpowering for her slender frame. The actress could not have felt comfortable, judging by how tense her shoulders looked.

~ STACEY CHIA