Kelly Osbourne's run in the West End production of musical Chicago is being extended until November.
Osbourne is already famous for her small screen and pop career
The singer and TV star will make her stage debut in the role of Mama Morton on 10 September, and is due to appear for a total of eight weeks.
The 22-year-old, thought to be the youngest actress to play the part, is tipped to appear in the Broadway show.
In a recent interview, Osbourne said she was nervous about making her first stage appearance since a school play.
She told The Sun newspaper that she played a windmill in the production.
Osbourne added that she has undergone a dramatic weight loss to prepare for the role, which will see the star take on eight performances per week.
She shot to fame in 2002 as one of the stars of MTV reality show The Osbournes, in which she appeared alongside father Ozzy, mother Sharon and brother Jack.
The family's antics were captured on the programme until it came to an end in 2005, while Osbourne also presented some TV shows, including a strand of ITV's I'm A Celebrity... Get Me Out of Here!
She also carved out a brief pop career, scoring a debut hit with a cover of Madonna's Papa Don't Preach, and went on to top the charts in 2003 with father Ozzy, singing Changes.