April 14, 2015 12:00 PM

Bruce Glikas/FilmMagic

It’s time for Billy Joel to start singing that lullaby again.

The “Piano Man” singer, 65, and girlfriend Alexis Roderick are expecting their first child together this summer, his rep confirms to PEOPLE.

The baby on the way — a source tells PEOPLE it’s a girl! — will be Joel’s second child. He has one daughter, singer/songwriter Alexa Ray, 29, from his previous marriage to supermodel Christie Brinkley.

Joel and Roderick, 33 — an accomplished equestrian and a former Morgan Stanley executive — have been together since 2009.

“Billy is thrilled to become a dad again,” the source adds.

They are keeping any further details about the pregnancy under wraps until they welcome their new addition, his rep adds.

— Tierney McAfee with reporting by Mary Margaret

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