Billy Joel and Alexis Roderick are officially married!

The 66-year-old singer exchanged "I Dos" with Alexis, 33 — who is pregnant with the couple's first child — in front of close family and friends in a surprise ceremony on Saturday, July 4, Billy's rep exclusively confirmed to People.

The wedding — which was held at Billy's Long Island estate — was officiated by the "Uptown Girl" singer's longtime friend, Governor of New York Andrew Cuomo, 57.

billy joel and alexis roderick

Billy and Alexis in December 2013.

Also in attendance at the ceremony was Billy's 29-year-old daughter, Alexa Ray Joel (from his previous marriage to Christie Brinkley, 61), and his friend, actor Kevin James, 50.

"Congratulation [sic] to the glowing bride and groom. And to my daughter Alexa, who has a wonderful friend in Alexis! Wishing the growing family every happiness!" Christie wrote on Instagram following her ex's nuptials.

In April, Billy and Alexis — who began dating in 2009 — confirmed they were expecting a baby, due this summer.