Lauren Conrad, Sofia Vergara, Joe Jonas ring in 2012 in Las Vegas

Lauren Conrad and her Hills co-star Stephanie Pratt were spotted at the star-studded New Year’s Eve party at Bellagio Resort & Casino in Las Vegas. Conrad tweeted her New Year’s Resolutions for 2012 which includes sending more thank you notes, having dinner with her friends once a week and organizing her closet once a month.

Modern Family star Sofia Vergara poses with Wilmer Valderrama and Joe Jonas at the New Year’s Eve party at Hyde Bellagio. “I’m very excited, because every place that Sam does is always amazing,” Vergara said, referring to Founder and CEO of sbe Sam Nazarian. “I was a fan of Hyde in Los Angeles, so I’m sure [Hyde] in Vegas is going to be even more fabulous.”

At midnight, the Fountains of Bellagio put on quite the show as balloons filled with $100 bills fell from the ceiling. Cha ching!

Photo: Mike Tran/Getty Images