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Though Amanda Seyfried recently said in an interview she wasn't sure if boyfriend Dominic Cooper was "the one," it looks like she may want to keep a watchful eye when it comes to her former Mean Girls co-star Lindsay Lohan!

Lindsay and several pals were spotted at the Belvedere party at the Cannes Film Festival, and they set up shop nearby the stage where Grace Jones was set to perform. We're not sure how this happened, but Dominic was part of the group, and a source for E! Online says, "They were having fun, paryting. Lindsay was dancing. They were being coy with each other. Not really touchy, but flirty. After Grace's performance the sat down at the table next to each other and were hanging out."

After Lindsay denied having a lesbian relationship with 36-year-old photographer/reality TV star Indrani, it looks like she's on the market -- we're just hoping she's not attempting to snag her co-star's sloppy seconds!