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PHOTOS: Gossip Flops And Love-able Looks In The Best And Worst

From the red carpet to the streets, stars were dressed in the best and worst fashions on Tuesday, and RadarOnline.com has photos of all the wardrobe winners and sinners in our daily fashion feature.

PHOTOS: Stars In The Best And Worst Fashions

Leighton Meester is definitely a contender for Blackwell’s Worst Dressed list of 2010. The Gossip Girl hit the red carpet of the Harry Winston Court of Jewels Recreation Launch in totally disturbing duds. Looking overexposed in an over-the-top Marchesa lace jumpsuit and Nicholas Kirkwood heels, the brunette babe snagged our Worst Dressed of the Day status.

PHOTOS: Sexy Celebs Who Have Good Taste In Bikinis And Bad Taste In Boys

Anne Hathaway was dressed to impress at a New York screening of Love & Other Drugs. The leading lady hit the red carpet in truly fem fashion, looking totally polished in a Valentino shift dress from the Fall 2010 collection and strappy metallic heels.

PHOTOS: Bikini Bad Girls! Trouble Makers Strip Down

Olivia Palermo rocked Mango a la mode in high style to the Spanish brand’s Spring/Summer 2011 presentation in Madrid, pairing a silk blouse and beige slacks, while Katy Perry looked powerfully purple in a skintight Zac Posen dress at her Purr by Katy Perry for Nordstrom Pop-Up NYC Event.

PHOTOS: Bikini By Color! Celebs Strip Down And Show Off Their Favorite Shades

And Andie MacDowell and Ally Sheedy failed to impress with their tacky duds at the WE Do Good Awards in NYC, while Rihanna looked a bit too edgy for The Late Show with David Letterman, wearing cutoff shorts over black tights.

PHOTOS: Hollywood’s Hottest Bodies In The Radar Bikini Awards!

Who else rocked and shocked with their choice of threads? Find out on RadarOnline.com.