The competition was fierce on the red carpet this week, as Hollywood’s hottest stars flocked to swanky events, award shows and premieres wearing the best, worst & wackiest fashions. RadarOnline.com has rounded up all of the wardrobe winners and sinners in the weekly fashion feature you don’t want to miss!

PHOTOS: The Best, Worst & Wackiest Fashions Of The Week

It was almost impossible to pick the top look this week, as several sizzling stars were dressed in flawless fashion, but Jennifer Lopez slid into 1st place by a hair! The stunning superstar perfectly showed off her bombshell body at the 11th Annual Latin Grammy Awards in Las Vegas, wearing a magnificent metallic Andrew GN gown.  The sleeved wonder featured a plunging keyhole neckline, which accentuated her sexy top half, and was constructed out of body skimming material, which made the most of her covetable curves.

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Cher has made it quite clear that she wishes she could Turn Back Time, but she needs to grasp the painful truth: she can’t!  The iconic singer, who is set to hit the big screen this month in Burlesque, has been busy promoting her flick all over the country, wearing faux pas fashions from the 1980’s and 90’s.  From her Late Show look of cutout leggings over fishnet tights paired with a belted sheer shirt---to her Glamour Women of the Year Awards Elvira ensemble---the Academy Award-winning “Goddess of Pop” was the Worst Dressed star of the week!

PHOTOS: The Best, Worst & Wackiest Fashions At The CMA Awards

Style was not compromised at the 44th CMA Awards on Wednesday, as country music’s hottest crooners and big screen babes got all done up for the Nashville event. While Taylor Swift opted for a red hot Monique Lhuillier gown (see her here!) which featured a dangerously high slit, Gwyneth Paltrow showed some skin in a crafty cutout Atelier Versace one-shouldered number. And Nicole Kidman stood by her man, Keith Urban, thinking outside of the box by pairing her amazing Dolce & Gabbana white lace cocktail dress with cutout heels.

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At the World Premiere of Harry Potter and the Deathly Hallows: Part 1, Emma Watson dazzled in an uber-short Rafael Lopez lace and feathered frock, which she finished off with towering Charlotte Olympia pumps, while Gossip Girl Clemence Poesy looked like she was headed to a 1970’s prom in a poof-shouldered lace Chanel frock. And of course, Helena Bonham Carter brought the wacky factor to the red carpet, wearing a bizarrely constructed dress with a horrible hairdo.

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Fergie celebrated her Glamour Woman of the Year title at the magazine’s bash in NYC, wearing a curve-skimming Zac Posen gown in flawless fashion, where Kate Hudson was also dressed to impress in a side slit Lanvin gown and Brian Atwood heels.

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See all the highs and lows on the fashion front this week in RadarOnline.com’s weekly feature!

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Jennifer Lopez was in fierce fashion at the 2010 Latin Grammy Awards in Las Vegas, hitting the red carpet in breathtaking a la mode. While the rest of the guests decided to wear blindingly bright colors, the sizzling star showed off her covetable curves in body-skimming Andrew Gn gown, which a sexy peephole.  Well done, Jen!

PHOTOS: Stars In The Best And Worst Fashions

Clemence Poesy is no doubt a style star on the rise, so we were quite shocked when we spotted the Gossip Girl at the London premiere of Harry Potter And The Deathly Hallows: Part 1, wearing a lace Chanel creation, which should have remained in the 1970’s prom circuit.

PHOTOS: Stars Hit The Red Carpet At Harry Potter Premiere

Camilla Belle also heated up the Latin Grammy Awards in high style, wearing a color-happy Carolina Herrera Spring 2011 gown.  Charo was clad in her usual wacky fashion, looking like a Sin City showgirl in a sparkly gold disaster, while other guest committed such fashion sins as neon colored cornrows and blindingly hideous gown.

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January Jones looked sexy and sophisticated in Versace at Central Saint Martins 20:20 Fashion Fund, while Ashley Greene wore a lackluster Giambattista Valli dress with black tights and heels to Inside the mark Studio in NYC.

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What other fashion crimes were committed on Thursday night? Find out on RadarOnline.com!

It was an action packed weekend on the red carpet, as stars got all dolled up in the hottest designer dresses for the most exclusive events across the world, but not everyone made the hot list!

Nicole Richie was perhaps the biggest disappointment of the weekend, hitting the Opening Gala and Unmasking of the Resnick Pavilion at LACMA in a truly over the top Marchesa gown! The fearless fashionista was drowning in the black and white tulle costume, which seemed like a totally out of character choice for the bohochic babe.

PHOTOS: Best, Worst & Wackiest Fashions Of The Weekend