From the red carpets of the swankiest soirees and movie premieres to the city streets, stars were dressed in the best, worst & wackiest fashions this week—and RadarOnline.com has the photos to prove it in our weekly roundup!

Click Here To See Stars Dressed In The Best, Worst & Wackiest Fashions Of The Week

Blake Lively had everyone Gossiping at Cinemacon in Las Vegas, stepping out in two sexy ensembles. After looking white hot in Dolce & Gabbana at the Warner Brothers Presentation, she ravished in a scarlet red Marchesa mini at the Big Screen Achievement Awards.

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Vanessa Hudgens may have looked fab in Alberta Ferretti at the London premiere of Sucker Punch, but her choice of streetcar shortly after had us wondering if she had been hit.

As for the wackiest look of the week, Nicki Minaj scored the title by a landslide. The sassy rapper hit the NET-A-PORTER Runway to Green at Christie’s BID to Save the Earth, wearing Alexander Wang from head to ‘Dakota’ boots—finishing the look off with a lettuce head hairdo!

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Diane Kruger was also at the swanky NYC soiree, dazzling in a Jason Wu petticoat dress, which she paired with pink satin heels and a clutch from the same collection, while Keri Hilson was out in Los Angeles, bundled up in all the most awful attire from the 1980’s and 90’s for GUESS and Paper Magazine’s The Beautiful People Party.

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Katie Holmes left her frumpy fashions at home and got all glammed up first lady style for the world premiere of The Kennedys in Los Angeles. Wearing a pale blue Ralph Lauren knit dress with nude strappy sandals and an ‘S’ necklace for Suri, Katie channeled Jackie O. to perfection.

Other style scores included Helen Mirren, who looked lovely in Lanvin at her Hand and Footprint Ceremony in Hollywood (wearing Salvatore Ferragamo heels and Neil Lane bling), Michelle Williams who got classy in Chanel Couture at a screening of Meek’s Cutoff and Gwyneth Paltrow, who was flying high on the fashion front with her casual duds.

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Other a la mode mishaps were courtesy of David Hasselhoff, who wore an Easter Bunny like suit to the Los Angeles premiere of HOP and Hayley Williams of Paramour, who looked goth gross, while out and about in Beverly Hills.

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What other stars rocked and shocked on the fashion front this week?  Click here to find out.

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From the red carpet to the runway (of international airports that is!) stars were out and about on Monday dressed to rock and shock - and RadarOnline.com has all the photos in our daily fashion feature.

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Katie Holmes left her frumpy fashions at home and got all glammed up first lady style for the world premiere of The Kennedys in Los Angeles. Wearing a pale blue Ralph Lauren knit dress with nude strappy sandals and an 'S' necklace for Suri, the Katie looked tres Jackie O.!

Hollywood's hottest stars will be hitting the red carpet at the Nokia Theatre in Los Angeles on Wednesday night for the 2011 People's Choice Awards, and RadarOnline.com will be bringing you all of the action!

PHOTOS: The Best, Worst & Wackiest Fashions At The People's Choice Awards

Before the star-studded show, you don't want to miss this special fashion flashback with photos all the best, worst & wackiest fashions from years past.

Sandra Bullock Blind Sided the world with her beauty and smashing fashion sense at the show in 2010, hitting the red carpet in stellar style.

Stars bounced back to the red carpet after the holiday weekend, hitting the town in the best, worst and wackiest fashions. RadarOnline.com has rounded up all the fabulous photos in our weekly feature, where no celebrity is immune to a fashion police arrest!

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

Lea Michele brought Glee glamour to the Billboard 5th Annual Women in Music Awards in New York City, hitting the high note with her designer duds.  The beautiful brunette rocked a white hot, multitiered Giorgio Armani mini with simple nude pumps for an absolutely sensational look!

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It is hard to keep track of Kourtney Kardashian's wild wardrobe changes! The reality show star, who seems to step out in three different outfits every day, hit the town in NYC doubling up on leopard print in totally tacky fashion. Her sizzling hot sister Kim also had a bad fashion attack, wearing a totally unflattering and awkward ensemble.  See it here.

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Jennifer Lopez continued to sizzle in sexy style.  The bombshell babe was  announced as a National Spokesperson for The Boys & Girls Club of America,  hitting the stage in a skintight and sexy Herve Leger by Max Azria bandage dress, which she paired with Brian Atwood Maniac heels. And that's why she's called La La Lopez, folks!

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Now that Winona Ryder is on the road to career comeback, the 1990's blockbuster babe should think about hiring a stylist! Wino hit the NYC premiere of The Black Swan dressed like a dude (more specifically like a gangster at a formal funeral) in a tuxedo-style Givenchy suit. Upping the style ante at the swanky screening was Mila Kunis, who showed off her bombshell body in a rosy Elie Saab gown, and Natalie Portman in an off-the-shoulder Christian Dior gown.

Reese Witherspoon got dressed in sophisticated style to receive her star on the Hollywood Walk of Fame.  The blonde beauty opted for a Dolce & Gabbana polka dot frock, which she perfectly paired with red heels.

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Madonna opened up her Hard Candy Fitness Center in Mexico City, puffy-faced and dressed in an outfit that looked like it belonged to Lourdes, while Pamela Anderson was a candidate for Stars Without Makeup while frumpily shopping for furniture in Venice Beach.

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Who else rocked and shocked this week with their wardrobe choices?  Find out in RadarOnline.com's weekly fashion feature.

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The stars were out in full force on Wednesday dressed to win, as well as sin; and RadarOnline.com has rounded up all the photos in our daily fashion feature!

PHOTOS: Stars In The Best And Worst Fashions

Katy Perry dominated the Grammy Nominations Concert Live in Los Angeles, in truly standout style. The newlywed showed off her bombshell body in a gold, off-the-shoulder Georges Chakra stunner, adding Brian Atwood Maniac heels to finish off the award-winning look.