The 'Fashion Police' star has always had problems with her feet - including painful bunions and flat feet - but had no idea how bad they were until she went to the doctor.
She said: "So, apparently, I've been walking around on a broken foot for weeks without realising something was wrong. My feet always hurt because of my bunions, but started to feel it in my ankle and knee and it turns out I had a couple of stress fractures."
However, Kelly refused to have surgery or a plaster cast put on it because she didn't want to disrupt her too much although knows she can't put it off forever.
She wrote in her column for Closer magazine: "I didn't want a plaster cast because I can't take it off for work or shower properly, so I have a special boot thing to wear ' I don't know how long for, I have to get it checked every couple of weeks. To get surgery on it, I'd have to block out four months for the recovery period and I can't do that. It really hurts, but I'm used to it now and use ice and ibuprofen to keep on top of it. I can't put surgery off forever, though!"
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