Marc Malkin Senior Film Awards, Events & Lifestyle EditorCasting Julie Andrews as the voice of narrator Lady Whistledown on Netflix’s new buzzy period drama “Bridgerton” was such a tightly held secret that the stars of the show didn’t even know about it.Regé-Jean Page, who plays the dashing Simon Basset, Duke of Hastings, says he found out when it was announced on Twitter. “I was on the train.