Buckingham Palace says the couple became engaged in Italy earlier this month. The wedding will take place in 2020. "We are both so excited to be embarking on this life adventure together and can't wait to actually be married," the couple said.
Andrew and Sarah, who remain on very good terms despite their 1996 divorce, said in a statement they are "thrilled" with the engagement. "We send them every good wish for a wonderful family future," they said.
They said they are "the lucky parents of a wonderful daughter who has found her love and companion in a completely devoted friend and loyal young man." Their younger daughter, Princess Eugenie, married Jack Brooksbank last year.