Ryan Gosling and Michelle Williams (Coyly) Deny They're Dating

12/21/2010 at 04:35 PM EST

Ryan Gosling and Michelle Williams (Coyly) Deny They're Dating
Michelle Williams and Ryan Gosling
John Shearer/Getty
They've been knocking down romance rumors for months now, and he's been spotted getting close to Blake Lively recently.

But it seems Ryan Gosling and Michelle Williams still want to keep everyone guessing.

In an interview with ABC News Nightline airing Tuesday, host Cynthia McFadden asks the Blue Valentine costars, both 30, if they're a couple.

As they exchange long glances, Gosling, who also calls her a "sexy cowboy" in the interview, whistles as if to pretend he didn't hear the question and Williams can't stop smiling. Gosling puts his arm around Michelle shakes her head "no" with a broad, mysterious grin.

After a long pause, McFadden is not convinced. "I don't believe that," she says.

Later, Gosling responds to questions of his truthfulness by joking, "I always look like I'm lying. It's just – that's my face."

They appeared equally besotted back in May, when Blue Valentine screened in Cannes and the pair stayed close and held hands for much of the night; before that they got cozy at the Sundance Film Festival in January.

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