Fab or Flop: Rihanna's mullet, Paula Pattons' sexy dress, & more of this week's celeb style

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Fab or Flop: Rihanna's mullet, Paula Pattons' sexy dress, & more of this week's celeb style
Olivia Wilde stunned in a sexy black pantsuit.
Always one to impress, Lady Gaga stepped out in one of her most interesting creations yet: a dress that blows bubbles!
Ke$ha re-emerged from what we can only presume was a dungeon.
Emma Watson stunned in a midriff-baring white top with oversized sleeves.
In a light blue dress, newly-turned 30-year-old and royal aunt Pippa Middleton stepped out on the town looking casual and chic.
Martha Stewart looked like the definition of refined outside of New York Fashion Week.
Nicole Richie stunned in a dazzling cutout jumpsuit as she hosted the Style Awards this week.
Former "American Idol" contestant Jennifer Hudson stunned in NYC wearing a dark red leather skirt and a simple black sheer top.
We hope this is a temporary look for Rihanna! We are not fans of the mullet the singer debuted in NYC this week.
"Blurred Lines" singer Robin Thicke's wife Paula Patton stunned in a sexy orange dress with mesh cutouts.

Celebs are fickle fashion creatures. Some weeks they look like a million bucks, and other times you're wondering if they got dressed in the dark. As celebs hit the red carpet, stepped out for lunch, and attended the hottest parties, we were there every step of the way, tracking the best and worst of this week's celeb style!

Plenty of celebs, like Paula Patton and Emma Watson looked absolutely fab and sexy this week, while others like Ke$ha and Rihanna turned out to be total flops.

Click through the gallery above to check out the best and worst of this week's celebrity style and find out who's Fab and who's a Flop!
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