John Lennon's son Sean has scoffed at the attitudes of some of the late Beatles star's fans for allowing Lady Gaga to play the musician's iconic piano.

Lennon and Yoko Ono's son posted a picture on Twitter this week of the 'Bad Romance" singer playing the instrument, but he instantly ran into a wall of criticism from fans of his late father.

Undeterred, Sean defended his decision to allow the pop sensation to use the piano, insisting his followers shouldn't be 'so judgmental.'

In a series of posts on Twitter, he wrote: 'Pianos are meant to be played. Why is everyone so uptight?'

'What should we do, lock it away in a dusty room? So judgmental. Come on, lighten up, life's too short, there're enough real problems in the world.'

Later he added:

'Firstly, he gave that piano to my mother for her birthday, it is hers, secondly, he was not uptight the way you seem to be.'

You have to admit he has a point. It's the kind of thing his father would have said, too.