Sports Illustrated's Swimsuit Issue launch party was a hot place to be in NYC last night. SI's new cover girl Kate Upton posed in a red dress alongside fellow models Chrissy Teigen, Bar Refaeli, Alyssa Miller, Anne V, and Irina Shayk. Kate, Chrissy, and Alyssa followed the bash with a flight to Las Vegas, where they'll continue to promote the issue. The ladies stripped down to their bikinis in the latest installment of the annual magazine, which also features athletes Rafael Nadal, Michael Phelps, and Chris Paul. Another pro may be in Kate's life, though there are rumors that Kate Upton is dating Mark Sanchez, the Jets quarterback, but neither has confirmed the romance.