Fab or flop: Jennifer Aniston's sexy tousled hair, Ali Lohan's sheer top, and more celeb style

Fab or Flop 8.8
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Fab or flop: Jennifer Aniston's sexy tousled hair, Ali Lohan's sheer top, and more celeb style
Selena Gomez accepted the Fan Favorite Award and Most Anticipated Tour Award at 2013 Young Hollywood Awards looking great in all black.
Jessica Alba stepped out with her adorable daughters, Hope and Haven Warren, in a casual yet chic outfit.
Joe Jonas' all white performance outfit made up of denim jacket, white t-shirt, white jeans, and grey Converse is one of the strangest concert looks we've seen all summer.
With legs for days, Kylie's sis Kendall Jenner looks absolutely gorgeous in a black and white outfit that can easily transition from day to night.
While singers like Beyonce are able to pull off chopping their hair like Miley Cyrus, Jessie J should stick to her long dark locks.
In a complementary bright blue dress and neon pink heels, former Destiny's Child bandmate Michelle Williams stuns with her simple style.
What's Jane Fonda wearing at the red carpet premiere of "The Butler"? Skinny jeans, black boots, heavy jewelry, and a shimmer-y jacket? We're definitely confused!
"America's Next Top Model" host Tyra Banks stuns in a black dress with a gorg pink pout.
Emma Roberts pairs a simple peach dress with black heels for the perfect end of summer look.
Kourtney Kardashian is mommy perfection with her sleeked back 'do and casual blue jeans with cute as can be daughter Penelope Disick.
While Ashlee Simpson usually looks fab, notably as the face of sister Jessica Simpson's clothing line, the singer's wild hair and sheer cut-out dress are far from red carpet ready.
Has California been renamed "Kalifornia" after the Kardashians? Even if not, Kim, Kourtney, and Khloe's little sis has the right idea with a great back to school inspirational look.
Jennifer Aniston's hair may be a little wild, but it's the perfect sexy summer look for the beloved actress.
While big sister Lindsay Lohan may be making positive moves, Ali Lohan took this summer's sheer trend in the wrong direction with her thin white top over a black bra.

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 Jennifer Aniston, Tyra Banks, and Selena Gomez looked absolutely fab this week, while others like Joe Jonas and Ashlee Simpson turned out to be total flops.

Click through the gallery 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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