**EXCLUSIVE** Kate Upton and her sister Christie Upton seen leaving Arthur Ashe Stadium after watching the men's semi-finals played during US Open 2013, fourth and last tennis Grand Slam of the season in New York City - DrunkenStepFather.com

EXCLUSIVE Kate Upton and her sister Christie Upton seen leaving Arthur Ashe Stadium after watching the men’s semi-finals played during US Open 2013, fourth and last tennis Grand Slam of the season in New York City