Britain's Prince William (L) smiles as he walks with his girlfriend Kate Middleton at RAF Cranwell, central England April 11, 2008.[Agencies]

British heir to the throne Prince William and his girlfriend Kate Middleton are to live together in Clarence House, the prince's official residence, this September. William's room has been carefully refurnished to accommodate the new lady of the house.

Queen Elizabeth II was reportedly "quite satisfied" with her future granddaughter-in-law after meeting Middleton at William's graduation ceremony. Prince Charles and Camilla Parker-Bowles, Duchess of Cornwall, are said already to regard Middleton as a family member.