Prince Philip reportedly had some wild advice for Prince Harry after his proposal to Meghan Markle. "One steps out with actresses, one doesn't marry them," the late Philip allegedly told his grandson, according to royal historian Andrew Lownie's book Entitled: The Rise and Fall of the House of York, which was released earlier this year. Philip's warning to Harry, 41, has been reported for years, but the royal family has not publicly commented. (Us Weekly has reached out to Buckingham Palace for comment.) Harry and Meghan, 44, kicked off their whirlwind romance in 2016.