New York, July 5 (IANS): Musician Billy Joel and his longtime girlfriend Alexis Roderick have got married in a surprise ceremony here in front of family and close friends.

The "Piano man" hitmaker married Roderick on Saturday evening, surprising guests, including family and friends, who had gathered for their annual July 4 party, reports eonline.com.

"(The couple) surprised guests at their annual July 4th party by exchanging vows in front of their family and close friends," a spokesperson for the couple said.

The couple held the ceremony at Billy's estate on Long Island, with politician Andrew Cuomo, "Zookeeper" actor Kevin James, and the musician's 29-year-old daughter Alexa Ray Joel, from his marriage to model Christine Brinkley, in attendance.

Brinkley, who was married to Billy from 1985 to 1994, was also present for the ceremony and later gushed about her ex-husband's beautiful bride.

She wrote on photo-sharing website 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! (sic)"

The news of Billy's fourth marriage comes just a few months after Roderick, 33, revealed she was pregnant with the couple's first child, a daughter, which is due later in the summer.