Singer/songwriter Billy Joel and his young wife Katie Lee are planning to start a family.

The RIVERS OF BABYLON hitmaker is already a father to 20-year-old Alexa Ray, from his marriage to model Christie Brinkley, but he wants more children with TV chef Lee, 24.

He tells the New York Daily News, "One kid would be lonely, wouldn't it?

"I would be as good a father as I was to Alexa, maybe even better because I'll be home a lot more.

"I would kind of like to be a house dad, actually."