Sin City casino mogul Steve Wynn threw his own royal wedding when he tied the knot with British beauty Andrea Hissom in a three-day event at Wynn Las Vegas last weekend. The affair attracted a bevy of high-profile guest — among them Jeffrey Katzenberg, Steven Spielberg, Sly Stallone, designer Tommy Hilfiger, musician Garth Brooks, fellow casino titan Donald Trump, and director Clint Eastwood, who served as best man and turned in a hilarious photobomb of this first snap of the bride and groom.