Mills was awarded a $48.6 million settlement from McCartney last month. They had been married for four years.
She told Britain's GMTV on Friday that she became angry when his lawyer, Fiona Shackleton, argued that full details of the case, including some related to the couple's 4-year-old daughter, Beatrice, should be disclosed.
"Mrs. Shackleton said something under her breath so I cleansed and baptized her," Mills said. "I thought she looked fantastic
- I thought it did her the world of good."
Mills, 40, had sought almost $250 million.
She spoke from Las Vegas, where she was judging the Miss USA pageant.
Asked about recent pictures in tabloid newspapers of McCartney, 65, and New Jersey trucking heiress Nancy Shevell, 47, Mills said she wished any new girlfriend luck.
"Well I think he's got three different girlfriends so I wish all the girls the best of luck," she said.
