Kelly Osbourne defies doctorsLos Angeles, March 21 (AZINS) Singer Kelly Osbourne is defying doctors' orders by exercising as she is determined to “stay in shape".

The 30-year-old wears a back brace after suffering a bout of pneumonia last year and though she has been told not to exert herself, she does a bit of it to stay fit, reports femalefirst.co.uk.

“I've had pneumonia and was having back pain so now I wear this all the time,” Closer magazine quoted Osbourne as saying.

“I've been told by doctors not to work out but I'm naughty and I still exercise a bit anyway -- I want to stay in shape,” she added.

Osbourne, who usually does three sessions of interval training a week, is desperate for her pain to go away so she can shed the brace and get back to her "regular" routine.

She said: "I just want to be well again so I can exercise properly and get back to my regular lifestyle."