Sharon Osbourne is being investigated for allegedly attacking a contestant on a TV show she hosts.

She is accused of pulling 26-year-old model Megan Hauserman's hair and scratching her until they were separated by security.

Shock: model Megan Hauserman said security guards had to pull Osbourne off her

Osbourne, 56, is reported to have flown into a rage when Ms Hauserman said she was only famous for managing "a brain-dead rock star" - a reference to her husband, Ozzy.

According to reports in the US, the model alleged Osbourne ran across the stage and attacked her during a break in filming of Rock Of Love: Charm School in Los Angeles on Saturday night.

Ms Hauserman went to hospital yesterday and reported it to the police. The pair were appearing on a reunion edition of the show which has contestants competing to learn etiquette in order to win $100,000.

A spokesman for Los Angeles Police Department said Osbourne was a suspect in a case of "minor battery" but no charges had been filed yet.

Ms Hauserman was kicked out of Charm School in an episode broadcast in November in the US.

Speaking about the model after she was evicted, Osbourne said: "She said her ambition was to be a trophy wife. Oh God. Well she has got the f**king brain of a peanut. "She does have a pretty damn good body, but no f**king brain. Her brain is between her legs." Osbourne is well known for falling out with her co-stars.

While a judge on The X-Factor, she threw a glass of water over Louis Walsh after the Irishman made a joke about Ozzy, the former lead singer of heavy metal band Black Sabbath. And she also admitted sending her own excrement in Tiffany boxes on more than one occasion to people she felt had unreasonably criticised her or her family. When a journalist criticised her children Jack and Kelly, when they were in their early teens, Osbourne sent a box of excrement with a note which read: "I heard you've got an eating disorder. Eat this."