SCREEN star Dame Julie Andrews has revealed she once cheekily re-enacted a famed scene from The Sound Of Music without realising a group of tourists was on hand to see it.

The actress - who starred in the film as Maria, the governess to the Von Trapp family - thought she was alone when she burst into song on what she believed was a deserted Swiss hillside.

But in an interview for last night's edition of BBC1's The Graham Norton Show, she said that moments later she realised she had an audience.

Dame Julie, 78, said: "I had to get fit for a role.

"So I used to go to Switzerland and I was walking around in the mountains.

"One day I thought, 'This is ridiculous, there's not a soul around' .

"I sang The Hills Are Alive - just as a whole bunch of Japanese tourists came over the hill.

"You should have seen their faces."