Kelly Osbourne was in the zone at the gym when she injured her foot from her over-zealous use of the treadmill.
She wrote in her Closer magazine column, explaining:
"This week the doctor finally found out how I hurt my foot. Thank god, because I was starting to get sick of people looking at me like I was a lunatic when they asked me how I did it and I couldn't answer.
"Running too hard on the treadmill caused me to pull the tendon away from the bone and give myself stress fractures. Now it's just a matter of time until it heals properly and gets back to normal.
Popular VideoThis young teenage singer was shocked when Keith Urban invited her on stage at his concert. A few moments later, he made her wildest dreams come true.
"Thank god, because I was starting to get sick of people looking at me like I was a lunatic when they asked me how I did it and I couldn't answer."
She also said:
"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 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!"