Britain's Prince William (R) and his fiancee Kate Middleton pose for photographers during a photocall to mark their engagement, in the State Rooms of St James's Palace, central London, on November 16, 2010. Prince William will marry his girlfriend Kate Middleton next year, the royal family said Tuesday, in the biggest royal wedding in Britain since his parents Charles and Diana married in 1981. The announcement ended feverish speculation about when the second-in-line to the throne would wed, after a romance that has already lasted nearly eight years. AFP PHOTO/BEN STANSALL

Kate Middleton, fiancee of Britain's Prince William, shows off her engagement ring as they pose for photographers during a photocall to mark their engagement, in the State Rooms of St James's Palace, central London on November 16, 2010. Britain's Prince William has given his fiancee Kate Middleton the engagement ring that belonged to his late mother Diana, Princess of Wales, Clarence House said Tuesday. The blue sapphire and diamond ring was given to Diana by William's father, Prince Charles, when they became engaged in February 1981. Charles and Diana divorced in 1996 and she was killed in a car crash in Paris the following year. AFP PHOTO / BEN STANSALL

Kate Middleton, fiancee of Britain's Prince William, shows off her engagement ring as they pose for photographers during a photocall to mark their engagement, in the State Rooms of St James's Palace, central London on November 16, 2010. Britain's Prince William has given his fiancee Kate Middleton the engagement ring that belonged to his late mother Diana, Princess of Wales, Clarence House said Tuesday. The blue sapphire and diamond ring was given to Diana by William's father, Prince Charles, when they became engaged in February 1981. Charles and Diana divorced in 1996 and she was killed in a car crash in Paris the following year. AFP PHOTO / BEN STANSALL

Kate Middleton, fiancee of Britain's Prince William, shows off her engagement ring as they pose for photographers during a photocall to mark their engagement, in the State Rooms of St James's Palace, central London on November 16, 2010. Britain's Prince William has given his fiancee Kate Middleton the engagement ring that belonged to his late mother Diana, Princess of Wales, Clarence House said Tuesday. The blue sapphire and diamond ring was given to Diana by William's father, Prince Charles, when they became engaged in February 1981. Charles and Diana divorced in 1996 and she was killed in a car crash in Paris the following year. AFP PHOTO / BEN STANSALL

Britain's Prince William and his fiancee Kate Middleton react as they pose for photographers during a photocall to mark their engagement, in the State Rooms of St James's Palace, central London on November 16, 2010. Britain's Prince William has given his fiancee Kate Middleton the engagement ring that belonged to his late mother Diana, Princess of Wales, Clarence House said Tuesday. The blue sapphire and diamond ring was given to Diana by William's father, Prince Charles, when they became engaged in February 1981. Charles and Diana divorced in 1996 and she was killed in a car crash in Paris the following year. AFP PHOTO / BEN STANSALL