The stars sit back and enjoy the U.S. Open action in New York City. Plus: Pharrell Williams, Gabrielle & Dwyane and more!

SUMMER THRILL

Julianne Hough heads out in Los Angeles on Thursday, where she met up with her 2007 Dancing with the Stars partner Hélio Castroneves. "Bring home the #IndyCar trophy this weekend!" she posted on Instagram, posing with her pal and his sleek ride.