Prince Charles celebrates his 50th birthday party Saturday with longtime love Camilla Parker Bowles, who is hosting the event at the prince's Highgrove estate, New York's Daily News reports. Charles' mum, Queen Elizabeth II, will reportedly be absent. She has even less regard for Charles' paramour than she did for his wife, Princess Diana, sources told the News. Instead, the queen will attend grandson Peter Phillip's 21st birthday bash. He's the son of Elizabeth's only daughter, Princess Anne.