British film star Paul Bettany had an unusual experience with HELENA BONHAM-CARTER when they filmed a love scene together - she passed wind during a steamy clinch.

The A Beautiful Mind hunk - married to his pregnant OSCAR-winning co-star JENNIFER CONNELLY - was shooting the sexy clinch with FIGHT CLUB star Helena for new flick The Heart of Me.

He says, "I'm not sure whether this should be in print, but I'll just tell you anyway. I got terribly embarrassed and English, I thought, I don't know what the correct protocol is when somebody farts on your penis during a sex scene so I was just silent and she was looking at me. And the whole crew was quiet because everybody had heard it.

"I thought she was going to blame it on me. And she went, 'Paul, I just farted on your penis. Isn't that funny?' And all the crew laughed."