Sharon TV brawl claims.
Megan Hauserman claimed the former X Factor judge launched a vicious assault on her during a break in filming Osbourne's latest TV show Rock Of Love: CharmSchool.
Hauserman said Osbourne, 56, pulled her hair and scratched her until security guards dragged them apart.
The 27-year-old model left a Los Angeles hospital with her armin a sling.
A source said: "Megan says Sharon sniped at her so she made a disparaging comment back, saying Sharon is only famous for managing a braindead rock star.
"Then she said Sharon ran across the stage and started screaming and attacking her.
"Sharon doesn't let anyone get away with bad-mouthing her family."
Former Playboy Bunny Megan won Beauty And The Geek 3 and starred in I Love Money and Make Me Your Trophy Wife.
The alleged incident happened while filming a reunion special for the VH1 show, where contestants had etiquette lessons, with the best student winning pounds 50,000.
A spokesman for LA police department said Osbourne was a suspect in a case of minor battery but no charges had been filed.
A spokesman for Osbourne said: "It was a minor incident blown out of all proportion."