From the red carpet to the streets, stars were out in full force this week wearing the best, worst & wackiest fashions and RadarOnline.com has all the photos in our weekly feature!

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

Has Justin Bieber been rubbing off on Selena Gomez? While her pop tart beau has proclaimed purple as his signature shade, the Disney darling has been rocking a lot of red as of late and we aren't complaining! Selena hit the Disney Kids and Family Upfronts in NYC, rocking a super sexy Dolce & Gabbana brocade mini dress, with gorgeous Brian Atwood Donna heels. Finished off with a glossy coat of red lipstick, the teenage dream scored herself the best look of the week.

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Taylor Momsen grunged down into grotesquely goth getup for her Pretty Reckless show in suburban Virginia. Wearing lace thigh highs with a garter belt, lingerie-looking skirt, shredded tank and buckled Christian Louboutin boots, the former Gossip Girl wasn't exactly a vision of the average 17-year-old!

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And Steven Tyler scored the wackiest look of the week slot by a landslide, hitting the PaleyFest event for American Idol dressed to shock.  The Aerosmith rocker was spotted in leopard jeans, a girly white blouse, a beige leather jacket, a long scarf and cowboy boots.

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Michelle Trachtenberg and Kelly Rutherford got all glammed up for 2011 School of American Ballet Winter Ball in NYC.  While Michelle looked marvelous in a lilac embroidered Marchesa gown, which she paired with a clutch from the same collection and David Yurman earrings, Kelly killed it in a one-shouldered embellished Robin Brouillette floorlength.

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Other best dressed babes included bride-to-be Reese Witherspoon who stepped out in Los Angeles with spring in her step, Alicia Silverstone, who showed off her massive baby bump in Rebecca Taylor maternity a la mode and Aldo heels, and Kristin Wiig, who ravished in ruffles in a flirty Stella McCartney gown at the Los Angeles premiere of Paul.

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Style sinners included Katie Holmes, Mary-Kate Olsen and Pharell, who all committed fashion fur pas, Christina Aguilera, whose Dolce & Gabbana red mini dress couldn't save her from a spray tan gone bad and Serena Williams, who had a catsuit catastrophe, while out to dinner with Kelly Rowland.

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See all the best, worst and wackiest fashions of the week, by clicking here.

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From the streets to the red carpet, stars were out in full, fashion force on Wednesday, dressed in the best and worst fashions—and RadarOnline.com has all the photos in our daily feature.

PHOTOS: Stars In The Best & Worst Fashions Of The Day

If purple is Justin Bieber’s trademark shade, then scarlet red is quickly becoming his galpal Selena Gomez’s!  The Disney star ravished on the red carpet at the Disney Kids and Family Upfronts in NYC, rocking a sexy Dolce & Gabbana mini with Brian Atwood Donna heels.  Later in the day, Selena hit MTV-7 looking sophisticatedly sexy in a Matthew Williamson bustier and Giuseppe Zanotti bowed heels with a form-fitting black suit.

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Paris Hilton committed a fashion fur pas in Los Angeles.  The gorgeous heiress wore a body-drenching floral frock with a fur-trimmed cardigan, snaky purse and hippie dippy headgear.

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Eva Green did not live up to her Bond Girl expectations at the NYC screening of Cracks, managing to make a skintight Tom Ford dress look frumpy.

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Kristen Bell, Wendie Malick and Leslie Mann all stepped out in charitably chic style to The Alzheimer’s Association’s 19th Annual A Night At Sardi’s in Beverly Hills, while Estee Lauder spokesmodels Joan Smalls, Hilary Rhoda, Constance Jablonski and Liu Wen brought their fabulous sense of fashion to the beauty brand’s Every Woman Can Be Beautiful celebration in NYC, unveiling their new Idealist Even Skintone Illuminator and Idealist Cooling Eye Illuminator.

PHOTOS: Bikini Bad Girls!  Trouble Makers Strip Down

Who else rocked and shocked on the fashion front?  Click here to find out.

From the swanky streets of Beverly Hills to the slopes of Aspen, stars were enjoying the holidays in the best and worst fashions. RadarOnline.com has all the photos in our daily fashion feature!

PHOTOS: Stars In The Best And Worst Fashions

Kate Bosworth looked chic as she shopped at Barney’s New York in the 90210 zipcode. The blonde babe rocked skinny jeans with a fuzzy sweater and cowboy booties, as she scoured the uber-expensive shoe selection at the luxury department store.  Also at Barney’s?  Preggers Rachel Zoe was dressed in kill, while Olivia Munn and Emmy Rossum looked casually chic in sophisticated duds.