Fab or flop: Paula Patton's sexy leather dress, Christina Aguilera's fit new bod, & more of the best & worst of this week's celeb style

Fab or Flop 8.19
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Fab or flop: Paula Patton's sexy leather dress, Christina Aguilera's fit new bod, & more of the best & worst of this week's celeb style
We're huge fans of Brittany Snow's simple gray and white dress that lets her beautiful makeup, and poppin' lip color shine.
Britney Spears announced her exciting Las Vegas residency earlier this week--but we think she should've lost the sunglasses since the sun hadn't risen yet!
Solange is always on point with her style and we loved this all white look she rocked earlier this week. We especially loved the bright, hot pink lip!
Nicky Hilton looked pretty as can be in a red lace gown--and that sparkly clutch, oo la la!
We think Jessie J's short blonde 'do is absolutely adorable, but we're not fans of her maroon jacket with her all black outfit.
One Direction band member Harry Styles attended London Fashion Week looking like a truly stylish gent, animal print and all.
Alicia Keys' sheer top was a total style miss, especially since we probably would've loved the high-waisted black pants and sparkly blue top without it!
Not only do we love Rihanna's sexy crop top, we're also obsessed with her eclectic collection of rings!
Selena Gomez rocked a super short shirt dress at a performance in Milan this week and she looked like she was ready to go to bed!
Paula Patton rocked a sexy Robert Rodriguez leather dress out and about in NYC.
Celebrity stylist Rachel Zoe looked chic per usual this week at an event, dressed in all black with gold accents.
We hope that distressed and torn up jeans, like the pair Kris Jenner was wearing this week, aren't coming back in style!
Kourtney Kardashian made a now-rare appearance this week, wearing epic gladiator sandals, a casual blue dress, and a big, floppy black hat.
Seriously: does Beyonce ever look any less than stunning?
Blake Lively sat next to Vogue's Anna Wintour at the Gucci spring 2014 runway show and the pair looked as gorgeous as can be.
Christina Aguilera showed off her slimmed-down new bod when she appeared on the "Tonight Show with Jay Leno" this week.

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 some of our favorite celebrities 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!

Rihanna, Harry Styles, and Kourtney Kardashian looked absolutely fab and sexy this week, while others like Kris Jenner and Britney Spears 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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