Movie hunk Gerard Butler has confirmed reports he once fooled around with reality Tv star Brandi Glanville, but he insists he had no idea who she was at the time.

The 300 star appeared on shock jock Howard Stern's show on Monday (11Mar13) and opened up about his fling with Eddie Cibrian's ex, who once revealed the Scot was an 11 out of 10 in bed.

Butler admitted he had hooked up with the Real Housewives of Beverly Hills star at at beach party, but she refused to tell him what she did for a living - and he only knew her as Brandi.

He recalled, "We hung out, we had a bit of fun and then suddenly, one day, I'm walking down the street and this papper (photographer)... runs up in my face and says, 'So, Brandi Glanville says you're great in bed...' You know what I said? 'Who's Brandi Glanville?' because, one, I didn't know her last name, and, two, I didn't know she was a celebrity - and I didn't know she was gonna go and tell people about it (fling).

"I felt bad... Then I worked it out... and I called her and said, 'One, I'm not very happy that you did that because there are certain things you've got to keep a little private, and, two, I'm sorry because I said I didn't know who you were.'"