The real reasons Kelly Osbourne pulled out of Chicago

She had to bail out of her final night last week after injuring her back and may have caused long-term damage to her vocal cords.

An on-set source says: "Kelly has been throwing her voice around and is worried she may have caused real damage."

The role of Mama Morton was Kelly's first professional theatrical role.

Before her much-awaited appearance at the Cambridge Theatre on September 10th she said:

"It's been a dream of mine to be in the West End."

She followed a string of guest stars including Brooke Shields, Claire Sweeney and Denise Van Outen who have appeared in the show.

Let's hope Kelly, 23, recovers to film the new series of Project Catwalk next month.