The former butler of Britain's late Princess Diana is to sell his own brand of wine in the U.S. Paul Burrell - who was once described by the princess as her "rock" - will soon embark on a tour of the States to promote his Royal Butler tipple.

A bottle of Burrell wine is expected to retail at around $10.

Burrell, 48, is quoted in Britain's The Sun newspaper as saying: "I wouldn't give my princess just anything and I won't give American ladies just anything either."

The former royal servant, who saw himself as one of Diana's closest confidants, has been criticized for cashing in on the late princess' name. He has penned two tell-all books, 'A Royal Duty', published in October 2003, and 'The Way We Were', released last September.

Burrell's second tome failed to match the success of his first best-selling novel.

He has also been attacked for suggesting Diana's sons Princes Harry and William are no longer flying the flag for their mother.

Burrell allegedly believes that, as one of the princess' most trusted friends, he should play a key role in the memorial show the princes have organized for their mother later this year.

The commemorative event, which will take place at London's Wembley Stadium on July 1, marks the 10th anniversary of Diana's death.