Billy Joel’s Daughters Sing ‘Happy Birthday’ for His 70th at MSG

[[tmz:video id=”0_49q9055r”]] Billy Joel got a pretty special birthday gift — 2 of his daughters, who are 30 years apart in age, joined him onstage at his show … to wish him a happy 70th. Mr. New York State of Mind put on a show for a sold-out crowd…

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