The site said the ex-model's leg "must fall off, not be purposely taken off, during a dance routine for all 'Yes' wagers to be graded a win."
Mills told syndicated television show "Extra" that she wanted to show people that "even with a prosthetic leg" can dance.
"It's very unlikely my leg's going to fly off even though it would be quite funny to knock one of the judges out," she said during the interview.
The show involves 11 couples -- a celebrity paired with a professional dancer -- competing in a variety of ballroom performances. Its fourth season is scheduled to begin on March 19 on ABC.
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