Heather Mills McCartney leaves the High Court in London as divorce proceedings continue between her and husband, musician Paul McCartney March 6, 2007.An online gambling site is taking bets on whether Heather Mills' artificial leg will fall off during her upcoming appearance on "Dancing with the Stars." [Reuters]

LOS ANGELES - An online gambling site is taking bets on whether Heather Mills' artificial leg will fall off during her upcoming appearance on "Dancing with the Stars."

Mills, 39, the estranged wife of Beatle Paul McCartney, lost her left leg below the knee in a traffic accident in 1993. She is the first contestant on the hit ABC television show to compete with an artificial limb.

A week before Mills' March 19 debut, Antigua-based gaming site http://www.bodog.com opened bets on whether her prosthetic leg would fly off during a dance routine -- and made "no" a heavy favorite.

The site added that Mills' leg "must fall off, not be purposely taken off, during a dance routine for all Yes wagers to be graded a win."

Mills, a former model, has been upfront about her unique challenge. "It's very very unlikely my leg's going to fly off even though it would be quite funny to knock one of the judges out," she told U.S. celebrity TV show EXTRA last week.

"I'm hoping to show people that even with a prosthetic leg you can dance," Mills said.

Mills will be paired with professional dancer Jonathan Roberts on the dance contest show. Other celebrities in the season starting March 19 include female boxer Laila Ali, the daughter of Muhammad Ali, country singer Billy Ray Cyrus and Olympic speed skater Apolo Anton Ohno.