I think (haven't looked it up to verify it) that he's only been married twice: once to Christie Brinkley and another time before

2 that I know of. A better question might be How many car accidents did Billy Joel have before he finally went to rehab?

According to Wikipedia he has had 3 http://en.wikipedia.org/wiki/Billy_Joel Marriages Joel married his business manager, Elizabeth Weber Small, on September 5, 1973. She was the former wife of his music partner, Jon Small, in the short-lived band Attila. They divorced on July 20, 1982, though he kept her on as his business manager, a move that would prove to be a mistake, according to his Behind the Music interview, as her brother, Frank Weber, embezzled almost all of Joel's savings. Joel married Christie Brinkley on March 23, 1985. Their daughter, Alexa Ray Joel, was born December 29, 1985.[20][21] Alexa was given the middle name of Ray after Ray Charles, one of Joel's musical idols.[22] Joel and Brinkley divorced on August 25, 1994, although the couple remain friendly. On October 2, 2004, Joel married 23-year-old Katie Lee. At the time of the wedding, Joel was 55. Joel's daughter, Alexa Ray, then 18, served as maid-of-honor. Joel's second wife, Christie Brinkley, attended the union and gave the couple her blessing. Lee works as a restaurant correspondent for the PBS show, George Hirsch: Living it Up!. In 2006, Katie Lee hosted Bravo's Top Chef. She did not return for a second season, instead going on tour with her husband. She now has a weekly column in Hamptons Magazine, and is a field correspondent for the entertainment television show Extra. "After nearly five years of marriage Billy Joel & Katie Lee Joel have decided to separate. This decision is a result of much thoughtful consideration. Billy & Katie remain caring friends with admiration and respect for each other." On June 17, 2009 they announced their formal separation after months of speculation.