Palace officials say William and his wife Kate Middleton, Duke and Duchess of Cambridge, have departed on their delayed honeymoon.
William's office declined to say where the couple have travelled and for how long, but stressed on Tuesday that the couple has requested that their privacy is respected during their honeymoon.
The couple decided against an immediate overseas honeymoon after getting married in London at Westminster Abbey on April 29.
They opted instead to spend their first weekend of married life at their home before William returned to military duty.
The palace says the prince has taken two weeks leave, but would not specify how much of that time will be spent on his honeymoon.
British media on Tuesday widely reported the honeymoon had kicked off in the Seychelles islands.