Nicole Richie is so tired of on-off pal Paris Hilton trying to steal every aspect of her life that she's telling pals she wants the copycat socialite gone at any cost, NW reports

"She thinks Paris is a total nightmare to be around and just wants her to go away," a friend says. "She isn't happy about Paris once again crashing her life."

Nicole feels that jealous Paris is pulling a "Single White Female" on her and is trying to clone her every move. First she started dating Benji Madden, the twin brother of Nicole's fiancé Joel, and now the heiress has been telling pals she wants to marry her new rocker beau. Even more alarming are rumors Paris may already be pregnant to Benji.