David Arquette has been making some serious new moves on the dance floor while rehearsing for his Dancing with the Stars debut on Monday, and the actor revealed that despite the tough competition, he has the greatest respect for his rival contestants  -- especially transgender star Chaz Bono.

"I think Chaz is great, he is an activist and has a lot to say," Arquette told RadarOnline.com in an exclusive interview at the Los Angeles Confidential Pre-Emmy party at the London West Hollywood.

"It’s really admirable of him to step out and put up with the criticism and be himself, and be comfortable with himself. It’s just been great," explained Arquette, 40, whose older sibling Alexis Arquette is a transgender actress and musician.

The Scream star went on to voice his dislike about the outcry from conservative groups who have complained about Chaz being on the show.

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

Miley Cyrus keeps letting everyone know that she most definitely Can’t Be Tamed!  The not-yet-legal starlet hit up the Hollywood hotspots on Thursday night (isn’t there a curfew when you are 17-years-old?)  scantily clad and showing plenty of skin in tiny denim cutoff shorts and a crop top.  They say less is more, but in the case it really wasn’t enough!

PHOTOS: Stars In The Best And Worst Fashions

Katherine Heigl looked Life As We Know It divine at the NYC premiere of her latest flick.  The beautiful blonde modeled a figure flattering one-shouldered cocktail dress from the David Meister collection with sexy silver Rene Caovilla silver sandals.  Also dressed to impress on the red carpet was mother-to-be Ali Larter, who fabulously flaunted her baby bump in a sexy, skintight black lace mini dress.

PHOTOS: More Best And Worst

Alexis Arquette + Bobby Trendy = the ultimate fashion disaster!  The two Worst Dressed list re-offenders were spotted outside of a Hollywood nightclub together, resulting in a double wardrobe whammy.

PHOTOS: Stars Hit Variety’s Power Of Women Luncheon

Over in Paris fashion’s fabbest, including Tyra Banks and Gisele Bundchen, were gowned in the most glam of designer duds at the Vogue 90th Anniversary Party in Paris, while the chicest New Yorker’s hit the 7th Annual Keep A Child Alive Black Ball, where Alicia Keys demonstrated her knack for maternal mode in a lace strapless Dolce & Gabbana gown.

What other sins and wins occurred on the fashion front?  Check out the gallery in Style to find out.