Prince Harry has reportedly nicknamed Pippa Middleton 'Commando' because of a rumour she went to the Royal wedding without underwear.

And Pippa, the owneer of world's most famous ass, has taken to calling the Prince 'Captain' — his rank in the army.

Pippa became an overnight sensation in April when her sister Kate Middleton married Prince William in a wedding ceremony watched by hundreds of millions.

The image of Pippa's shapely figure in a slinky bridesmaid dress, carrying the future princess' white flowing train down the aisle, has graced as many magazine covers as pictures of the royal couple themselves.

Since the wedding, speculation has been rife that Harry has taken a fancy to the 27-year-old party planner.

Friends insist the two are simply good pals.

But an 'insider' has told Grazia:  "They speak on the phone all the time and have met up at least five times since the wedding, once for tea at his Clarence House apartments… She thinks he's got a really cheeky sense of humour."