The ex-Beatles and Wings star, who married Washington-born model Heather Mills two years ago, spent two hours at North Biddick Social Club, in Fatfield, on Saturday.
And his visit was the talk of the town – within minutes of ordering his drink, a pint of Smooth Beer, punters from neighbouring bars piled into the club to meet the music legend.
Club stewardess Monica Graham said: "Everyone had a fantastic night.
"We knew he – McCartney – was coming, but had been sworn to secrecy.
"When he arrived people drinking here started ringing their pals in other pubs to tell them who they were sitting with.
"He stayed for two hours, sat in the lounge and had one pint. He shook everyone who came to see him by the hand and spoke to them.
"He was such a nice lad and acted just like he was someone from the village. It was amazing how well he fitted in.
"At the end of the night he came up and gave me a kiss on the cheek. It made my night."
Mrs McCartney didn't go to the club, but was in the region over the weekend visiting relations and friends, the Echo understands.