James 'mistress': 'Kat Von D needs to run'

Michelle 'Bombshell' McGee, the former alleged mistress of Jesse James, has urged his fiancée Kat Von D to call off their engagement.

The tattoo model, whose reported affair with James destroyed his four-year marriage to Sandra Bullock, warned that the Monster Garage star is not to be trusted.

"Kat, run for your life. He is a cheater," she announced on The Wendy Williams Show. "You cannot change a man, you cannot change a leopard's spots. Once a cheater, always a cheater. He cheated on a beautiful woman like Sandra Bullock, what makes you think he won't cheat on you?"

McGee also declared herself to be a "fan" of Bullock, stating that she holds nothing but "respect" for the Oscar winner.

"Sandra, I'm sorry girl, but you did the best thing by divorcing him. But I give you so much credit for holding your head up high and looking amazing and just doing what you do. I really respect you.

"I love Sandra Bullock," she added. "I'm a huge fan. She's hot! She's really cute."

James and Von D began dating in 2010 and announced their engagement last week.