Duchess Sophie ‘partied with Princess Kate’ to mark her milestone 60th birthday ExpressPrincess Kate Will Reportedly Join “Royal Sister” Duchess Sophie for a Glittering 60th Birthday Bash Yahoo EntertainmentPrincess Kate and Prince William stepped out to support Duchess of Edinburgh on milestone occasion GB NewsPhotographer Behind Sophie, Duchess of Edinburgh’s Birthday Portrait Shares Unseen Photo from Session PEOPLEInside Duchess Sophie’s lavish 60th birthday plans: partying with Princess Kate, celebrity guest list and more HELLO!
