Keira Knightley has been snapped smooching Mark Ruffalo on the set of their new film Can A Song Save Your Life? in New York.

Knightley's fiance James Righton has nothing to worry about though as she was just acting out scenes as her character Greta, who plays a dumped singer-songwriter embarking on a new romance after the musician she moves to New York with (Adam Levine) leaves her to go solo.

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Keira pulls away at first

Knightley's character soon gets the upper-hand when she meets Dan, a music-executive, played by Ruffalo.

The musical drama is from director John Carney, whose movie Once won an Academy Award for Best Original Song in 2008

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But she soon gives into Gruffalo's charm

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