Kate Upton donned a little white dress to unveil her new Sports Illustrated Swimsuit Issue cover in NYC today. A huge billboard of the cover on display in Times Square features Kate in a skimpy bikini with a sexy smile on her face. She later headed to The Late Show for her first official appearance as an SI star. Nineteen-year-old Kate follows in a long line of ladies to be honored with the coveted spot, including Brooklyn Decker, Bar Refaeli, and Irina Shayk. Kate was featured in last year's Swimsuit Issue wearing a painted-on bikini, and has also modeled for Victoria's Secret.