Dancing With The Stars foxtrotter Heather Mills is so confident her prosthetic leg won't fly off while she's competing on the show - she has bet money on it. The charity campaigner and estranged wife of Sir Paul McCartney is amused by websites offering bets on whether the leg will stay on or not, and has decided to join in the fun. She says, "I think it's funny. It's about having a sense of humour." And she told talk show host Jay Leno, "Everyone's betting on it, so I've bet a few hundred dollars that it will stay on."