Revellers could not believe it when the future king and his brother turned up at their local pub.

Prince William and Harry joined their soon-to-be groom cousin Peter Phillips on a rowdy stag do - a month before he weds Canadian fiancee Autumn Kelly next month.

By day the royal rabble raced yachts and by night downed bitter with locals at the Anchor in Cowes on the Isle of Wight.

Lymington Yacht Charters, the largest fleet of luxury yachts for corporate hospitality in Europe, was called to organise the stag do four months ago and arranged a friendly race, between Lymington and Yarmouth.

The royal party then enjoyed Saturday lunch Salty's restaurant in Yarmouth.

Charter company managing director John Arnold, said: "They got soaked. It was such a wet windy day.

"Harry came first but it was very close. The atmosphere was great, everyone was excited and happy."

The royal brothers were part of a stag group that arrived in town on Friday, staying at Cowes hotel Rawlings.

Having spent much of Friday night at the Anchor, drinking with locals after having a meal there, the party returned to the well-known historic Cowes pub last night.

The group of around 27 had earlier enjoyed drinks at seafront restaurant Lugleys, before marching into town in matching rugby shirts marked Pedro's Cowes Tour 2008.

Princes William and Harry - whose shirts had the names Wills and Hazza printed on the backs - were joined by a man dressed in a camp fancy dress bikers outfit, believed to be the stag.

The previous evening they had been dressed in cricket whites.

Playing rowdy drinking games involving a funnel and a length of pipe - which at one point saw Prince Harry holding the funnel in the air while drinks were poured in the funnel for pub-goers to down - the group mixed with drinkers in the packed back bar of the pub, before leaving through the back entrance to the nearby Painters Arms.

"They were having a great time and didn't seem to want to leave the pub," said a reveler.

Anchor manager Ashley Pamphillon said they first knew of the Royal visit just a couple of minutes before they arrived on Friday when they were told they might recognise a couple of members of the group who would be eating dinner in the back bar.

"We didn't really have to make any special arrangements.

"They were just very nice and very polite, which is all we ask of any customer," said Mr Pamphillon.

Surprised drinkers looked on as the royal brothers enjoyed bottles of Becks and pints of Strongbow.

They headed back to Rawlings for a private party at around 11.30pm.