According to the rep, when McCartney pulled up in a car with fellow musicians Beck and Foo Fighters drummer Taylor Hawkins, they tried to get in through a side door but couldn't because it was an exit door that remains closed at all times.
When a security guard opened the door, the former Beatle asked, "Is this the Mark Ronson party?" When the security guard confirmed that it wasn't Ronson's party, the three artists returned to their car and left.
McCartney was later spotted at the Republic Records GRAMMY after-party alongside Taylor Swift, The Weeknd, Ariana Grande, Selena Gomez and Lorde. McCartney's wife, Nancy Shevell, was also present.
"Paul McCartney literally danced the night away with his wife, Nancy. So adorable," a source tells ET. "And he was surrounded by Beck, Woody Harrelson and Taylor Hawkins. The song that got him up dancing was 'FourFiveSeconds.'"