It's been just over a week since Lindsay Lohan and Samantha Ronson's famed Twitter break-up and already Ronson is kicking it with a Lohan replacement and doppelganger, according to the Chicago Sun Times.

While  Lohan was desperately trying to crash a Ronson-hosted party at the renowned Chateau Marmont last weekend, celebrity DJ Ronson was very close with another woman.

Ronson was 'clearly with another woman -- somewhat of a Lindsay look-alike, but with very dark hair,' an insider at Chateau said. 'They sure looked very cozy, if you know what I mean.'

Another snitch reported that a woman named "Cindy," who matches the description of Ronson's Château mystery date, was spotted leaving Ronson's Los Angeles home Sunday.

Meanwhile, Lohan, who has been hitting Hollywood clubs solo, according to TMZ, maintains that the couple is merely on a "break."