From the red carpet of the hippest events in the world to the city streets, Hollywood’s hottest stars were dressed in the best, worst & wackiest fashions over the weekend – and RadarOnline.com has all the photos.

While most people enjoy getting gifts on their birthday, Kim Kardashian treated her guests to an evening of white-hot sexiness!  The reality show star rung in her 31st in Sin City by showing off her famously curvy figure in a skintight, white dress, adding silver Christian Louboutin heels and
tons of white ice.

PHOTOS: The Best, Worst & Wackiest Weekend Fashions Round-Up

M.I.A. resurfaced at the London Film Festival premiere of Madonna’s new movie W.E. The Paper Planes singer missed the mark a la mode, donning a metallic jumper with a rather unique wrap and high-top sneakers.

From the streets of Paris to the red carpet in Los Angeles, stars were out and about on Thursday dressed in the Best & Worst fashions and RadarOnline.com has all the photos.

Click Here To See Stars Dressed In The Best And Worst Fashions

Olivia Wilde is one of the sexiest stars in Hollywood, and we can’t get enough of her!  The House babe hit the Bvlgari Private Event Honoring Simon Fuller And Paul Haggis To Benefit Save The Children And Artists For Peace And Justice, dressed to thrill in a figure flattering Michael Kors LBD with nude platforms and Bvlgari jewels.

From a luxe Beverly Hills luncheon celebrating the most powerful women in Hollywood to the glam packed Anniversary Party of Roberto Cavalli in Paris,
the stars were out in full effect this week, wearing the best, worst and wackiest fashions. RadarOnline.com has all the photos of the wardrobe winners and sinners in our weekly fashion feature!

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

Katie Holmes showed up to the Variety Power of Women luncheon at The Beverly Hills Hotel, looking more Suri than sophisticated. Honored for her work with the Dizzy Feet Foundation, a charity she started with Nigel Lythgoe, Adam Shankman and Carrie Ann Inaba, the A-list babe experienced a fashion flop in a flowered Louis Vuitton frock, which she paired with black tights and heels.

PHOTOS: Variety Power Of Women Luncheon Attracts the A-Lister's

Rachel Bilson had a busy week overseas, taking advantage of the fabulous fashion shows in Milan and Paris. The ex OC-er prowled around Roberto
Cavalli's swanky 40th anniversary celebration in a wondrously wild floor-sweeping leopard print dress from the designer's collection. Absolute perfection,
Rach!

PHOTOS: Stars Heat Up Milan Fashion Week

What happens when Alexis Arquette meets Bobby Trendy outside of a Los Angeles nightclub? The ultimate fashion DON'T! The two Worst Dressed
re-offenders were definitely the Wackiest sinners of the week, with theirbizarre wardrobe choices.

PHOTOS: Birthday Girl Nicole Richie Parties In Her Bikini In Mexico

Other fashion flops? Nicole Richie learned the Truth About mixing patterns and textures, while in NYC promoting her latest book Precious, while Ice-T's
lady love Coco got a little too wild in a leopard print wrap dress.

PHOTOS: Gemma Arterton's Sultry Style

Gemma Arterton mastered the art of simply chic, hitting the NYC screening of her latest movie Tamara Drewe in an utterly gorgeous Bottega Veneta strapless gown. Eva Mendes also achieved a style score in the Italian designer's duds at the Variety Power of Women luncheon, adding a delightful
blast of color to the carpet.

Who else rocked and shocked on the fashion front this week? Check out RadarOnline.com's weekly feature and find out.

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Katie Holmes Brings Suri's Style To Variety Power Of Women Luncheon

EXCLUSIVE VIDEO INTERVIEWS: A-List Stars Hit The Red Carpet At Power Of Women Luncheon

From the Opening Night of the Metropolitan Opera to the sweltering hot streets of Los Angeles, stars were out and about on Monday showing off their fab and drab style.

Kerry Washington scored herself the best look of the day, hitting the opening night of Das Rheingold at the MET in a gorgeous Grecian style Marchesa gown, which featured purple embroidered detail.  The leading lady couldn’t have looked more sexy or sophisticated in the off-the-shoulder creation, which was perfectly hued for her skin tone.

PHOTOS: Stars In The Best And Worst Fashions

Miley Cyrus showed a little too much skin for seventeen, trying to beat the record-breaking heat in Los Angeles.  Her bra-baring lace top, which she paired with uber-tiny cutoff jean shorts and cowboy boots was a little too racy for her underage status!

PHOTOS: Stars Who Are Too Sexy Too Young

Cameron Diaz looked Knight and Day divine at the Tokyo premiere of her film, jazzing up a modest Bottega Veneta turtleneck dress with snazzy and color-happy Jimmy Choo sandals, while Gemma Arterton kept in sexy and simple in a strapless black gown at the NYC screening of Tamara Drewe.

It was a warm and balmy night at the Sunset Tower Hotel in Los Angeles, where Hollywood’s hottest starlets flocked to Lia Sophia’s preview party for the Lanaya II Collection. The designers of the celeb-coveted costume jewelry line, Elena Kiam and Dani Stahl, showed off the uber-glam collection to their gorgeous guests, which included The Hills alums Lo Bosworth and Stephanie Pratt, The Twilight Saga: Eclipse starlet Christian Serrratos and even Charlie Sheen’s ex Brooke Mueller!  RadarOnline.com scored an exclusive invite to the swanky event, which was truly sizzling in summer style.

PHOTOS: Stephanie Pratt, Lo Bosworth, Christian Serratos, Samaire Armstrong, Brooke Mueller, Golden Brooks, Ashley Scott, Stacy Keibler, Erin Lucas, Elizabeth Rohm, Charlotte Ross, Taryn Manning And Maria Menounos At The Lia Sophia Lanaya II Collection Launch

Though they may not be costars anymore, as The Hills celebrated the end of an era this week, but it appears that Stephanie and Lo still consult each other before they hit the carpet.  Both gorgeous gals were dressed to yacht, in naval inspired duds that were oh-so-summery. Dancing with the Stars hottie Stacy Keibler showed off her model figure in a one-shouldered alice + olivia white mini, which she paired with nude peep-toes, sharing her excitement about a scheduled appearance at the Comic-Con convention next weekend.

Star Splurge: Lia Sophia Cobble Stone Cuffs

Brooke Mueller looked far from stressed, making a short appearance dressed in black and white winter-worthy wear.  Perhaps Charlie’s ex should add a stylist to the payroll?

What fashionista jetted in from The City, channeling the Material Girl in cone-like fashion? Check out the gallery to find out.