Prince William's tribute to Princess Diana Prince William paid a sweet tribute to his late mother Princess Diana on Mother's Day. 15 March 2026 Prince William paid tribute to Princess Diana on Mother's Day (15.03.26). Prince William's tribute to Princess Diana The Prince of Wales, 43, marked the special day with an old photograph of him as a child with his late mother Diana, who died in a Paris car crash in 1997 when William was just 15. The photograph - taken at Highgrove in 1984 - showed William in a field of flowers, holding hands with his mother.