Harry Styles has proved himself to be a real-life prince charming. "I saw @caroleradziwill struggling to get her rather large @giambattistavalliparis dress up the grand stairwell. Naturally and quickly, I managed to get my iphone out of my dinner clutch to document what could have been fashion Parisian castle roadkill," Cassandra Grey wrote via Instagram on Monday, September 1, who alongside Styles, 31, and Carole Radziwill attended the wedding of Charles Porch and Robert Denning.