Billy Joel turned wedding singer on Friday night, when he helped U.S. shock jock Howard Stern celebrate his nuptials to model girlfriend Beth Ostrosky in New York City.Stern, 54, and Ostrosky, 36, exchanged vows on Friday at Le Cirque restaurant. They were joined by a host of celebrity pals including Joan Rivers, comedienne Sarah Silverman, and American TV personalities Barbara Walters and Jimmy Kimmel.Joel entertained the party guests with two songs, while funnyman Chevy Chase delivered a tongue-in-cheek roast to the newlyweds.After the wedding reception, Rivers said; "I danced with Howard. The wedding was fabulous, everyone had a great, great time."The marriage is Stern's second and Ostrosky's first.

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