Muhammad Ali hosts Celebrity Fight Night in Arizona

Boxing legend Muhammad Ali hosted this year's Celebrity Fight Night in Phoenix, Arizona, with a host of stars attending the event.

Ali, who suffers from Parkinson's disease, created the event to help raise money to aid those tackling the problem, was joined by the likes of Billy Crystal and singer Jennifer Lopez.

The 71-year-old presented American comedian Steve Martin with an award, shaped like a boxing ring, for his charity work.

Former boxer Evander Holyfield was also in attendance.