If Samantha Ronson thought dumping Lindsay Lohan was going to get the fallen child star out of her hair once and for all, she’s in for a rude awakening.

Just two weeks after the former couple’s often volatile romance came crashing to a halt, Lindsay Lohan has threatened to file a palimony suit against her one-time live-in lover.

Lindsay –who has not enjoyed a serious acting gig since the 2007 stinker I Know Who Killed Me– paid for everything during her nearly two year relationship with Samantha.

And now it’s time for payback.

A Star Magazine tattle claims: “Before Lindsay, Sam was making $10,000 a DJ gig. Now she makes $100,000. Lindsay wants a cut, like 10 percent of her future earnings for the next five years.”