It’s really sweet and going great so far." Joel and Brinkley, meanwhile, remain good friends.
RELATED: Inside Christie Brinkley and John Mellencamp's Hot New Romance "It's too early to tell what might develop," the insider added.
"But so far, Christie's certainly put a smile on John's face!
August 2014 was also a big month for Joel and his fourth wife, Alexis, after the two welcomed baby girl Della Rose Joel together.
, and Wendy of course got her talking about her personal life."I'm just having fun and, you know, we'll see," Brinkley said of her new relationship.
Billy Joel has a new reason to sing with joy — his wife has another baby on the way.
The Piano Man, 68, revealed he and Alexis Roderick are expecting their second child together — and he won't have to wait "for the longest time" for the new bundle of joy to arrive.
"I hope the next one will." The new baby will be Joel's third child overall.
He also has a 31-year-old daughter, Alexa Ray Joel, with his second wife Christie Brinkley.
(Photo Credits: Getty Images) The former supermodel, 61, and John were first spotted out together in NYC on Sept. "[Christie has] been a bit shy about putting herself back out there, [but] with John, there's comfort.