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"I had a broken pelvis when I danced in Dancing With the Stars," Mills tells Extra. "I've had a broken plate for a few years now, and it just pops out now and again."
Mills, who is ensnared in a high-profile divorce battle with Paul McCartney, has even been wheelchair-bound temporarily. "Then I got realigned and cracked back into place by a chiropractor," she says. "I'm down to one crutch now."
But she continues to soldier on. "I've had a high pain threshold for a long time," she says.
Mills was back in the DWTS studio this week to root on her former dancing partner, Jonathan Roberts, and Marie Osmond. And she tells PEOPLE that she gets a little teary when she watches at home.
"I was watching it with my daughter last week, and I got quite emotional and excited," she says. "I never got emotional when I was on it, but when I was watching it at home I wanted to cry. I had little tears and my daughter said, 'Mommy, are you okay?' And I said, 'Yeah, I'm fine.' And she said, 'Is it because Jonathan is dancing with another woman?' I'm so happy for them."
Mills did witness Osmond's fall live in the studio, and was scared for her. "I think everyone's hearts stopped for a second," she tells Extra.
