WORST: Sweats and high heels? Though we love her Yves Saint Laurent platform sandals, not even Mariah Carey can pull this look off!

WORST: Awards show or music video. Those are the two places Ciara can wear this super sexy cutout mini, but not to Katsuya in Los Angeles!

WORST: Bar Refaeli is clearly one of the sexiest women in the world, so when a dress doesn’t look good on her, it is doubtful that anyone can pull it off. Leo’s on-again-off-again gal pal hosted a Lexus party in Madrid in a blush-toned, body-hugging number, which flared into an uber-pleated skirt.

BEST: Kate Beckinsale enjoyed the first day of the Cannes Film Festival, attending the Jury Presentation Photo Call, wearing a plum and lavender Christian Dior ensemble from the Fall 2010 Collection. She paired the colorful getup with nude Brian Atwood heels.

WORST: Kelis looked like she was ready to fly away, wearing a mass of feathers with leather pants and tennis shoes.

BEST: Queen Latifah reigned the Late Show with David Letterman, looking super edgy and sexy by layering a black, sleeveless tunic over embellished leggings, adding oodles of bling and crafty, cutout heels.

WORST: Rachel Bilson hit the streets of Los Angeles, wearing brown and tan footwear, which almost looked like heeled construction boots.

BEST: Cate Blanchett looked angelic at the Robin Hood Photo Call at the Cannes Film Festival in a skirtsuit from the Armani Prive Spring 2010 Collection, which featured creatively sculpted shoulders. We love her matching Armani Prive shoes, which featured an asymmetrical black strap. The beauty was drenched in Van Cleef & Arpels jewels.

WORST: Russell Crowe was not looking so sexy after a day of traveling to Cannes, looking more like tourist than a movie star!

BEST: Imogen Poots looked beyond gorgeous at the New York premiere of Solitary Man, wearing a super girly Chanel Spring 2010 frock with heels from the same collection.

BEST: Jenna Fischer opted for a strapless LBD for the premiere of Solitary Man.

WORST: Richie Rich brought his equally as badly-clothed pal to the NYC premiere of Solitary Man, where the two made a mockery of the red carpet in their disastrous duds.

WORST: Rihanna partied early into the morning in London, wearing these extremely dizzying leggings with a cowl-necked top. We can only imagine what it was for onlookers to gaze over at her, after consuming a few too many drinks!

WORST: Sheryl Crow’s multi-colored feathered dress wasn’t exactly rocking us the right way!

BEST: Ashley Greene was a Twilight site, wearing high heels with jeans and a casual top, while running errands in Los Angeles.

BEST: Courtney Love looked smashing in NYC, wearing a sophisticated black frock under a gorgeous, gold-buttoned coat.

BEST: Gemma Arterton stunned in a Roksanda Ilincic silver strapless gown, while her Prince of Persia costar, Jake Gyllenhaal looked hunky in a dark suit.

WORST: Kristen Wiig must have been feeling a little wild when she put on this Stella McCartney zebra dress for a special screening of the Rolling Stones’ Stones in Exile’ at the Museum of Modern Art in NYC.

WORST: Evangeline Lilly fell victim to the unflattering jumpsuit at the special screening of the Rolling Stones’ Stones in Exile’ at the Museum of Modern Art in NYC, pairing her way-too-shiny, unflattering ensemble with YSL heels.

WORST: Lady Gaga loved her bejeweled bra and panties so much, she refused to wear anything but a cape over them!