The newest edition to the Grammy-winning singer's family came earlier than expected, as Joel told the Belfast Telegraph earlier this month that little Remy wasn't due until sometime in November.
MUSICIAN Billy Joel, 68, has become a father for the third time.
The five-time Grammy victor recently said that he's not anxious about losing sleep from taking care of a newborn.
Remmy Anne Joel was born at New York University Hospital, weighing seven pounds and three ounces.
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"Alexis and Remy are doing well, and everyone is thrilled", his rep added.
He also has 31 year old daughter Alexa Ray from his marriage to Christie Brinkley.
Joel and Roderick began dating in 2009 and got married in 2015.
Remy is the couple's second child together, as they are already parents to two-year-old Della Rose.
In 2015, when Della Rose was born Alexis posted a sweet picture on her Instagram account with the caption: 'Della Rose Joel. "She sleeps through the night", the star smiled as he talked about little Della.