Buckingham Palace has confirmed that the Queen has decided to grant three titles to Prince William: Duke of Cambridge, Earl of Strathearn and Baron Carrickfergus.
While his bride-to-be, Kate, will become Her Royal Highness The Duchess of Cambridge.
According to Clarence House, Prince William is 'honoured' to be given the title Duke of Cambridge.
The 28-year-old prince spent the evening before his wedding meeting the crowds outside Westminster Abbey with his brother Prince Harry.