Lady Gaga was so happy about her Grammys performance with Elton John, she decided to buy the piano she used on stage.

Gaga paid $470,000 for the instrument, which was designed by controversial Canadian artist Terence Koh.

A source told Music-News: "Terence's artwork is confrontational and incorporates many elements that appeal to GaGa such as sex, punk and gay culture. The black piano with arms reaching out of it was beautiful and it's no surprise she wants it, especially after giving one of the performances of her career."