Britain's Queen Elizabeth's favourite song is 'Itsy Bitsy Teenie Weenie Yellow Polka Dot Bikini'.

The 86-year-old monarch - who is celebrating her Diamond Jubilee this weekend - is a huge fan of the novelty record and was thrilled when Lord Andrew Lloyd Webber and Gary Barlow played it on the piano at a private party recently.

Andrew - who has teamed up with Gary for the jubilee's official single, 'Sing' - recalled of the night: "It was fun because we did a little cabaret of songs I knew she liked."

Gary added: "I thought I knew all the daft songs, but you (Andrew) know more."

Andrew also revealed how the queen gets concerned that people go to too much effort for her, especially when he and Gary were recording the song.

The musical mogul told the Daily Mail newspaper: "What I always hear about the queen is she worries that people have gone to too much trouble. When she heard there was an American girl singing with us, she said, 'I do hope Andrew didn't fly her over especially.' "

The queen's Diamond Jubilee celebrations start tomorrow (02.06.12) and finish on Tuesday (05.06.12).