It's been reported that the O.C. star fell away from Paris' circle of friends when she began dating Kimberly Stewart's ex-fiance Cisco Adler, but Mischa says they were never really friends. "I met her one or two times," Mischa told the Daily Mirror, "and she's making out there's this big rivalry between us and there so isn't."
"She seems to hate everyone around her age who is more successful. Silly bitch."
The actress, who has done her own turn of dating billionaire boys, also attacked Paris' appearance at the Brit Awards last week, commenting, "I tuned into the Brits because I like to know what's going on in British music and I saw her and I was like, 'What?' She was coming out with all this ridiculous stuff, like, 'I love London because... whatever.' Please."
And Mischa didn't mince her words when it came to the issue of boyfriends, claiming Paris didn't have a "hands-off policy" when it came to other people's men. "She does steal people's boyfriends!" she said.
In response, Hilton told the New York Daily News, "I don't even know the girl. I could care less. It seems like she's the one trying to stir up a rivalry. I've never said a word about her in my life. But she seems to be spending a lot of time thinking about me."
Barton's publicist insists the actress was "joking" when discussing Hilton.