WATCH: Paul McCartney Sings At His Nephew's Wedding

TMZ gets the goods again!!

If Paul McCartney is planning to be a guest at an upcoming affair, be sure to have the band practice a Beatles song or two in case he decides to sit in. That's what happened over the weekend when he sang at his nephew's wedding.

It took place at the Fresh Meadow Country Club in Lake Success, N.Y. McCartney, who turns 76 today, sang "I Saw Her Standing There" while the bride and groom, to whom McCartney is related through his wife Nancy Shevell, danced in front of him.

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