Queen Elizabeth II and Prince Philip.A bash with friends and family at Clarence House in London is on tap. The guest list includes his eldest son, Prince William, 41; his daughter-in-law, Kate Middleton, 41; and his wife, Queen Camilla, 76, along with other members of the royal family.Reports swirled last week that his estranged son, Prince Harry, 39, and his wife, Meghan Markle, 42, declined an invite to the party.