United Kingdom, Aug. 4 -- Billy Joel is actually very "shy" and "deeply introverted", according to his daughter Alexa Ray Joel.

The singer/songwriter has opened up about her famous father and insisted he's very different to his outgoing stage persona and "never buys [into] his own hype".

Alexa told New York Post column PageSix: "You know my father is really funny because he's he's like the most self-effacing person on the planet right?

"He never buys [into] his own hype.

"I'm like: 'You should be so proud of yourself!' He's like: 'Eh.' He's just not a typical, like narcissistic guy in the spotlight - he just does not buy into any of it -he's a true artist. He so deeply introverted, he's really actually a shy person."

Alexa went on to...