Billy Joel has married his girlfriend Alexis Roderick.

The couple "surprised guests at their annual July 4th party by exchanging vows in front of their family and close friends," the singer's spokeswoman said in a statement to PEOPLE.

Joel, 66, who has been married three times before, exchanged vows with his new bride Roderick, 34, at the singer's Long Island estate.

The small group of family and friends at the get-together had no idea that the couple were planning to get married

New York Governor Andrew Cuomo presided over the nuptials and those in attendance included Alexa Ray Joel, his 29-year-old daughter with model Christie Brinkley, his original Uptown Girl.

After they tied the knot, Brinkley wrote on Instagram: "Congratulation to the glowing bride and groom.. And to my daughter Alexa, who has a wonderful friend in Alexis! Wishing the growing family every happiness!"

The couple have been dating since 2009 and are expecting their first child together later this year.

"Billy is thrilled to become a dad again," a source told PEOPLE in April.

Joel is currently on tour, with his next sold-out stop at Boston's Fenway Park on July 16.

On Wednesday (1 July) he set a record for most performances by a single artist at Madison Square Garden with his 65th show.

More about celebrity weddings