Best, Worst & Wackiest Fashions Of The Weekend

• TAGS

• Best And Worst
• Christina Fulton
• Deena Cortese
• Emma Roberts
• Erin Andrews
• Fergie
• Holly Madison
• Karissa Shannon
• Kim Kardashian
• Kourtney Kardashian
• Kris Jenner
• Kristina Shannon
• Lady GaGa
• Lorenzo Martone
• Marc Jacobs
• Maria Menounos
• news
• Pamela Anderson
• photos
• rihanna
• style
• Vanessa Hudgens

By Leah Ornstein - Radar Style & Beauty Editor

From the red carpets to the streets, stars celebrated the end of 2011 and kicked off the beginning of 2012 in fab and faux pas fashion – and RadarOnline.com has the a la mode winners and sinners in our weekly feature.

Kim Kardashian closed out her not-so-stellar year by hosting a Sin City bash in sexy style. The newly single star steamed up her party at Tao nightclub, wearing a skintight dress with metallic Christian Louboutin peep-toes, while her sister Kourtney showed some leg at Chateau Nightclub’s New Year’s Eve Party wearing a slitty, sequined Diane Von Furstenberg gown with Christian Louboutin heels.

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

Pamela Anderson looked nearly nude and not-so-fresh-faced at Studio 54’s NYE bash in a skintight embellished dress with matching heels, while Erin Andrews had a fashion flop at the Rose Bowl, wearing super unflattering high-waisted pants.

• TAGS

• Style
• Best And Worst
• Christina Fulton
• Deena Cortese
• Emma Roberts
• Erin Andrews
• Fergie
• Holly Madison
• Karissa Shannon
• Kim Kardashian
• Kourtney Kardashian
• Kris Jenner
• Kristina Shannon
• Lady GaGa
• Lorenzo Martone
• Marc Jacobs
• Maria Menounos
• Pamela Anderson
• photos
• rihanna
• style
• Vanessa Hudgens

Karissa and Kristina Shannon celebrated their 21st birthday with dinner and a champagne-filled party for two.

• TAGS

• Karissa Shannon
• Kristina Shannon

The Shannon Twins -- Karissa and Kristina -- turn 21 today and the Playboy Playmates got the party started just after midnight Friday, RadarOnline.com can report.

PHOTOS: Shannon Twins Celebrate Their Birthday

• TAGS

• Heidi Montag
• hollywood happenings
• Hugh Hefner
• Karissa Shannon
• Kristina Shannon
• Playboy
• Playmates
• reality TV
• Sex Tapes
• Shannon Twins
• Spencer Pratt
• The Girls Next Door

Hollywood's next generation of superstars came out to celebrate one another for the 12th Annual Young Hollywood Awards at the Wilshire Ebell Theatre in Los Angeles on Thursday night, and RadarOnline.com was there to find out the perks of being hot, young and living in Tinseltown!

Watch the clip here on RadarOnline.com

Eclipse star BooBoo Stewart, 16, was in attendance to present Justin Bieber the "Newcomer of the Year" Award and exclusively told RadarOnline.com's Justin Walter that  the best part of being a young star is "just enjoying your life."

• TAGS

• BooBoo Stewart
• Doug Reinhardt
• Eclipse
• exclusive
• Hollywood
• Karissa Shannon
• Kristina Shannon
• Mariana Klaveno
• Nina Dobrev
• The Shannon Twins
• True Blood
• Twilight
• Vampire Diaries
• Vampires
• Young Hollywood Awards

Aside from their acting ambitions, Karissa and Kristina Shannon really just want to make Hugh Hefner proud.

RadarOnline.com caught up with the spirited girls at this weekend's Comic-Con, where they described in vivid detail their first nude photo shoot and video production for boyfriend Hefner's magazine Playboy.

Click here to see the twins discuss their role in Sofia Coppola's new film.

To earn their sparkling necklaces and esteemed induction as Playmates, the twins got in the buff and washed one of Hefner's classic cars.

• TAGS

• Comic-Con
• Hugh Hefner
• Karissa Shannon
• Kristina Shannon
• Playboy
• Shannon Ttwins
• Sofia Coppola

We're taking a look back at some of the lovely ladies Hugh Hefner has dated.

• TAGS

• Barbi Benton
• Brande Roderick
• Crystal Harris
• girlfriends
• Hugh Hefner
• Izabella St. James
• Karissa Shannon
• Kimberly Conrad Hefner
• Kristina Shannon
• Lillian Muller
• Playboy
• Playboy Bunnies
• Robert Urich
• Shannon Tweed
• Tina Jordan