Actress Michelle Williams had no problems watching her partner get hot and heavy with another man in controversial new movie BROKEBACK MOUNTAIN - because she didn't recognise him in the gay love scene.

Williams, who co-stars with her boyfriend Heath Ledger in the film, reveals she was actually on the set when the Australian movie hunk and Jake Gyllenhaal filmed their provocative sex scene and she just found the experience a passionate one.

She recalls, "Honest to God, I did not see the two boys I know. I did not see Jake and I did not see Heath when I saw that scene - and I know both of them well (one of them better than the other).

"So often, when you're doing a shot like that, the other actors aren't there but I was lucky enough. After the scene I just asked them to embrace, to just hold each other. It was a sweet moment."