Sarah Ferguson may be part of the royal family, but she still likes to have some bathroom fun on the side.

Britain's Fergie recently shocked diners at a top London restaurant by posing as a bathroom attendant - literally.

Sarah, the Duchess of York, had been enjoying dinner with celebrity pal Sharon Osbourne when the pair decided to have a bit of fun.

She told Britain's The Sun newspaper, "We had dinner in this really smart London restaurant. After a few drinks we thought it would be quite fun to go down to the ladies and pretend to be loo (sic) attendants. It's very naughty. But God it was funny."

She continued, "We were down there for half an hour and Sharon insisted we do it properly - handing people towels and opening cubicle doors for them. Most knew who we were and just smiled or looked really bemused. But one lady didn't recognize us and got irritated when Sharon asked her where she got her dress from. She thought we were being rude. It was hilarious."

The 47-year-old - the ex-wife of Prince Andrew - regularly hangs out in celebrity circles and earlier this year she took her youngest daughter Princess Eugenie to a party on Diddy's yacht in St. Tropez, where they mingled with the likes of Paris Hilton and Penelope Cruz.

The duchess and her two daughters Princess Beatrice, 18, and Eugenie, 16, were also VIP guests at Elton John's White Tie and Tiara ball.