The Royal couple are said to prefer nights in front of the TV watching their favourite DVDs and eating home-cooked meals at their Anglesey home rather than enjoying a night on the tiles.
So it was rather surprising to see William enjoying an evening out with close friend Guy Pelly at a private member's club in Mayfair.
Prince William with his Royal protection officer at a private member's club in Mayfair
Prince William will also be celebrating turning 30 on June 21 and Kate is said to be planning a huge bash
The Prince, who was not joined by his 30-year-old wife, was flanked by Royal protection officers and left the club looking rather bleary eyed in the early hours.
Harry will no doubt be pleased as he recently bemoaned his brother's quieter life and remarked William had become rather boring.
William is clearly getting some practice in as he is due to celebrate turning 30 on June 21 and wife Kate is said to be planning a party 'fit for a king'.
She is thought to be discussing ideas with some of William's closest friends and hopes to throw a party he'll never forget.
Close friend Guy Pelly, left, joined Prince William, who was flanked by protection officers, for the night out
Prince William's brother Harry has made jokes that his brother has become rather middle-aged since his wedding to Kate Middleton
Actress Naomi Watts who is due to play Princess Diana in a movie was also at the club with husband Liev Schreiber
Prince William and his wife Kate attend the wedding of Lady Emily McCorquodale to James Hutt
Earlier on Saturday the Prince was joined by Kate and brother Harry at the wedding of cousin Lady Emily McCorquodale to James Hutt.
Also spotted leaving the private member's club was British actress Naomi Watts and husband Liev Schreiber.
Watts has been chosen to play Princess Diana in a film about the final two years of her life. ( dailymail.co.uk )
