Kelly Clarkson has been forced to use a wheelchair after injuring her foot.

The original American Idol winner insisted the show must go on, as she is currently busy as a judge and mentor on US reality TV show Duets and promoting her latest single Dark Side.

Kelly tweeted a picture of herself having her make-up done sitting in a wheelchair and holding crutches.

She revealed: "Sprained my foot and have a hairline fracture but the show must go on people."

It is not known what caused the 30-year-old's injuries but she attended a festival in Brazil at the weekend.

Kelly is due back on the judging panel for the next live show of Duets on ABC later this week.