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Last night, Kanye West joined party host Fergie to celebrate the premiere of the highly anticipated 1 OAK Las Vegas at The Mirage on New Years Eve. After much speculation surrounding his twitter campaign to DJ on New Year's Eve, Kanye took the stage and thrilled party-goers with a 3 hour set. Dubbing himself YEEZYWORLDPEACE, Ye mixed tracks for Fergie, her hubby Josh Duhamel and some of the biggest names in Hollywood.

Despite being in the same city and amidst rumors that Kanye has been getting close with Kim K, the two did not spend NYE together and instead Kanye had a stunning brunette on his arm.

Mike "The Situation" Sorrentino and Good Charlotte kicked off an exciting New Year's weekend bash at Chateau Nightclub & Gardens at Paris Las Vegas last night. Reality star and fashionista, Nicole Richie, NBA legend, Julius "Dr. J" Erving, and gorgeous singer, Brandy, also celebrated the end of the year at the stylish nightclub.

Sorrentino is looking forward to getting some rest in 2012. "My New Year's resolution is to take it easy and relax more," said the Jersey Shore hunk.

But, that resolution would have to wait -- Sorrentino was anything but relaxed as he enjoyed celebrating the end of 2011. The MTV star yelled "Happy New Year" to fans and even threw his jewelry into the crowd.

Good Charlotte performed on the rooftop nightclub of Chateau Gardens. Brothers Joel and Benji Madden, as well as the rest of the band, gave fans an incredible once-in-a-lifetime performance under the Eiffel Tower of Paris Las Vegas as they sang "Lifestyles of the Rich and Famous," "Dance Floor Anthem" and more.

Nicole looked on and cheered for her man throughout the performance.

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At the brand new Hyde nightclub in Vegas' Bellagio hotel, special guest for the evening, Sophia Vergara, best known for her role as Gloria on TV sitcom Modern Family, arrived at the lounge looking stunning in a white, shimmering dress. When asked about her New Year’s Eve at Hyde, Sophia replied, “I’m very excited … I was a fan of Hyde in Los Angeles, so I’m sure [Hyde] in Vegas is going to be even more fabulous.”

Welcoming the New Year at Hyde Bellagio were Wilmer Valderrama, Joe Jonas, Leona Lewis, Eliza Dushku, Emile Hirsch, Lauren Conrad, Stephanie Pratt, Eric Stonestreet, Amber Lancaster and Lakers basketball player Rick Fox, among others.

Guests settled into their plush VIP tables as models in cellophane dresses posed around them holding celebratory New Year’s balloons. Songs like Tyga’s “Rack City” and Drake’s “Take Care,” featuring Rihanna, had clubgoers on their feet dancing and raising their glasses to a successful 2011.

Vergara pumped up the crowd as she counted down the remaining seconds of 2011. As the clock struck midnight, the iconic Fountains of Bellagio sprayed high above the Las Vegas Strip and gold and silver balloons filled with $100 bills fell from the ceiling. Throughout the venue, guests cheered, toasted and kissed to the year ahead.

She certainly knows how to make a mad dash!

Kourtney Kardashian was spotted running errands in Beverly Hills on Friday (literally!), and the pregnant reality TV starlet covered up her growing baby bump with a top from the family's Sears clothing line.

So what's she up to tonight? Kourtney and baby daddy Scott Disick (along with Joel and Benji Madden) are set to host a New Year's Eve bash at the Chateau Nightclub in Las Vegas, and she jetted out of LA about an hour ago. Last week Kourt tweeted, "Time for a fitting with @MonicaRoseStyle! What's a pregnant girl to wear for New Years Eve at Chateau in Vegas?! LOL!" Can't wait to see what she picks out!

Adam Levine and girlfriend Anne Vyalitsyna shopped at Yves Saint Laurent on Rodeo Drive the other night, and it looks like the duo are still going strong!

Anne and Adam met in February of 2010 at the Sports Illustrated Swimsuit Issue release party in Las Vegas, so they're coming up on their two-year anniversary. Think these lovebirds are in it for the long haul?

Kim Kardashian was spotted heading to a meeting at a hotel in Beverly Hills the other day, and after pulling up in her white Ferrari 458 Italia, she darted inside and skipped posing for pictures. What happened to the limelight loving starlet we grew to love on Keeping Up With The Kardashians?!

Is it possible that one of Kim's New Year's resolutions is to maintain a lower profile after her highly publicized divorce became tabloid fodder earlier this year? Yesterday she tweeted, "decided to change my twitter background to nothing. i wanna be more simple in 2012." Hmm, wonder how long that will last?

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Mariah Carey and husband Nick Cannon posted these darling shots of Moroccan and Monroe Cannon on the babies' official website, and the proud parents couldn't help but gush about their 8-month-old twins.

Mariah and Nick wrote:

"We are so elated to finally be able to show you some pictures of the beloved additions to our family ... We deliberated for so long about how to reveal the first pictures of our babies to the world. We just didn't want to do the typical thing and display them in a tabloid (not that there's anything wrong with that :))

We decided to share this beautiful experience with you in a special intimate portrait of our family ... Parenthood is absolutely the most life changing experience we could ever have imagined. The love we feel for these babies is above and beyond anything we'd ever dreamed of."

Awww!

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Giuliana Rancic and her husband Bill chatted with The Today Show's Matt Lauer yesterday, and the couple opened up about her struggle with breast cancer and her recent double mastectomy.

"It was definitely hard," Giuliana told Matt. "I knew this was going to be a tough surgery. I in no way want to minimize it. Yes, I'm two and a half weeks out, my gosh. Up until a week and a half ago, it was hell. It was horrible." However, Giuliana has already returned to work at E!, and she hopes that sharing her story will help educate women and raise awareness for the disease.

"She wanted to turn the negative into a positive," Bill explained. "I think the response - the number of people who've said, 'I went and got my first mammogram,' or 'My wife got her first mammogram' [is] worth it. If you can save one life through this process, you're turning this negative into an incredible positive."