David M. Benett/Dave Benett/Getty Images for Walpole Lady Kitty Spencer is Princess Diana's 29-year-old niece, which also makes her a first cousin of Prince Harry and Prince William. She got engaged to Michael Lewis, a 60-year-old, South African-born millionaire, before Christmas in 2019, the Mirror reported. Lady Spencer has been photographed wearing what appears to be her engagement ring. Insider spoke with jewelers and engagement ring experts, who said Lady Kitty Spencer's eternity-style band could cost anywhere from around $65,000 to $160,000, depending on the weights of each diamond. Visit Insider's homepage for more stories. Lady Kitty Spencer, the niece of Princess Diana and the first cousin of Princes William and Harry, recently got engaged to a 60-year-old fashion mogul and millionaire, Michael Lewis. Lewis reportedly proposed to Lady Spencer before Christmas, according to the Mirror.See the rest of the story at Business InsiderNOW WATCH: Each year, the US gets around 4 times as many twisters as the rest of the world combined — here's whySee Also:Harry and Meghan will completely step back from royal duties and stop using their titles starting in Spring 2020A London restaurant has launched a 3-course 'Megxit' menu featuring 'British and Canadian cuisine with elements of ginger and LA glamour'Prince William said he and Harry are 'separate entities' following his brother and Meghan Markle's plans to 'step back' from royal life, according to a friend