The Piano Man hitmaker and his girlfriend, Alexis Roderick, will welcome a baby this summer (15), according to the spokesman.

Joel already has a grown-up daughter, singer/songwriter Alexa Ray Joel, from his marriage to model Christie Brinkley. This will be financial adviser Roderick's first child.

The couple has been together since 2009.

According to Joel's rep, the singer and his girlfriend plan to keep any further details of the pregnancy "under wraps" until "their new addition makes an official debut".