EX MARKS SPOT FOR LINDSAY

Lindsay Lohan is now spending time with her ex, Stavros Niarchos, after she dumped rehab buddy Riley Giles a week ago. Niarchos, who used to date both Lohan and her frenemy Paris Hilton, this time is sticking with the newly sober star. Hilton showed up to a party for the anti-smoking lozenge Ariva at Crimson in Hollywood the other night and tried to hook up with Niarchos - who, spies said, "wanted nothing to do with her and seemed so annoyed by her, he left the party" to go hang with Lohan. Hilton, unaware she had irked Niarchos, was then seen wandering around "asking where Stavros had gone." Meanwhile, someone tried unsuccessfully to sell Lohan family Thanksgiving photos to the weeklies. A source said, "This person wanted $100,000 for a picture of Lindsay cutting the turkey surrounded by [mom] Dina and [sister] Ali. But [a week after the holiday] it wasn't timely. The price came down to $10,000, but no one bought them."

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