It seems she is an ABBA fan and she is particularly fond of the song Dancing Queen.
This inside information was passed on from BBC radio host Chris Evans, who it has been revealed is earning quite a few royalties of his own, after his friend attended a dinner at Windsor Castle with the Queen herself.
The story goes that after the dinner and speeches were done there was a dance where they played "proper disco music".
Dancing Queen came on and the Queen reportedly took to the dance floor saying, "I always try to dance when this song comes on, because I am the Queen, and I like to dance".
If the report is accurate, onlookers were said to be awe-struck by the sight of the Dancing Queen.