Basically, some woman has come up to Helen and told her that her boyfriend is cheating on her.. Helen is now turning around and saying that unfortunately, she already knew she was being cheated on, but this woman looking smug about it isn't helping..
She sang great. When I was in London years ago we went to see Song and Dance. Lulu was in it so we wanted to see how she'd do and of course she was out sick the night we went.
This song is about a woman who's trying to interfere with another woman's (Helen) man who is straying, but Helen is saying: I know you know, but I already know so take that look off your face.