Kate Upton Pictures at Las Vegas SI Bikini Party

Sports Illustrated's Kate Upton posed with her illustrious new magazine cover at Las Vegas's Pure Nightclub yesterday. She's the lucky lady fronting the annual Swimsuit Edition, following in the footsteps of last year's model Irina Shayk. The winner was revealed Monday, when Kate's sexy Times Square billboard was unveiled during The Late Show. Since then, Kate's been on the go with Chrissy Teigen and Anne V. For last night's party at Pure, Chrissy was joined by her fiancé, John Legend. Kate hit the bash solo, but she may be off the market. Kate Upton's dating Mark Sanchez, the Jets quarterback, according to reports. She hasn't confirmed the stories but did say that "he is cute" while chatting with Ellen DeGeneres recently.