It's not that uncommon for someone to sing at their spouse's company party. But it makes headlines when the singer is Paul McCartney.
Sir Paul rocked out his British Invasion classic "I Saw Her Standing There" a few nights ago at the party in Jersey City, New Jersey hosted by his wife Nancy for her family's New England Motor Freight (NEMF) company.
Imagine being at a party and someone famous shows up unannounced!