Gemma Arterton got "carried away" and stuck her tongue in co-star Jake Gyllenhaal's mouth while shooting their new movie.

The British actress admits she broke a strict rule while filming love scenes for their upcoming film 'Prince of Persia: The Sands of Time'.

She explained: "There's an unspoken no-tongues rule on set. But I got so carried away, it kind of slipped out."

Despite shocking Gyllenhaal — who is dating actress Reese Witherspoon — Gemma insists that her co-star should be thankful.

She added: "Everyone said I was lucky to be kissing him, but he's the lucky one!”

This is not the first time Arterton has made an embarrassing blunder while filming a love scene.

The 23-year-old star previously confessed to being a "giggling mess" when she filmed an intimate encounter with Daniel Craig for recent James Bond movie ‘Quantum of Solace’.

She said: “Kissing Daniel was great — I can't pretend it wasn't. It was my first day on set and I'd only met him once before — and then suddenly we were expected to kiss.

"He was very cool and I was a giggling mess. I mumbled something like: 'I just kissed you!' and he just coolly said: 'Yes, you did. And now we have to do it again.' Fortunately, he's an incredible kisser."