A little champagne celebration for the US Open: Julie Henderson, Rebecca Minkoff, Olivia Palermo, and boyfriend Johannes Huebl, competed in friendly matches of tennis at the first annual Moet & Chandon Tiny Tennis Invitational. Hanging out at the [grassy rooftop] of The Standard Hotel, exhibition players including Henderson, Minkoff, Palermo, Huebl, Horacio Silva and Bee-Shyuan Chang faced off against each other and guests, while […]