We don't know how Kate Middleton does it, but she looked fabulous in a heatwave as she and husband Prince William made their debut at Royal Ascot on Friday. The couple led the royal procession as Queen Elizabeth II opted out due the sweltering 90-degree heat — and we don't blame her for staying home. It was Kate's outfit that stole the show, and followed the strict Royal Ascot wardrobe guidelines, with her Alessandra Rich polka-dot dress, which she paired with a brown hat. Her hair was...