As a young man, Paul McCartney, like many young men in the UK, had a bit of a crush on the late Queen Elizabeth. He wrote a song about her called Her Majesty that kind of catches how he saw her, like a sort of far-off movie star.
She knighted the Beatles and later, at her Golden Jubilee, he played his cheeky song for her, which is kind of sweet.
She also had a nice sense of humor, which was illustrated in a recent video she did with Paddington Bear where he congratulated her for her Jubilee and thanked her for all that she had done.