Lindsay is such a mean girl! After a night of flirting and dancing, leaves a Cannes party with her former co-star’s now ex-BF!

Is Lindsay Lohan all about female solidarity? Not so much. The hard-partying starlet spent Tuesday night getting cozy with former Mean Girls co-star Amanda Seyfried’s boyfriend, Dominic Cooper — and the two even left a late-night party together!

But before you go casting stones at Dominic, 31, for cheating on 24-year-old Amanda, it sounds like the couple — who met on the set of the 2008 movie-musical Mamma Mia! — have officially split, reports People.
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