Watch Paul McCartney Join The Killers In Surprise New Year's Eve Appearance

Paul McCartney performs at MetLife Stadium
Mike Coppola/Getty Images

Paul McCartney performs at MetLife Stadium on Aug. 7, 2016 in East Rutherford, N.J.

"Helter Skelter" was on the set list.

Paul McCartney made an unscheduled appearance on New Year's Eve, joining the Killers on stage in St. Barts for Russian billionaire Roman Abramovich's exclusive New Year's Eve party.

Several attendees caught the moment on video, during which you can hear McCartney sing the Beatles' classic “Helter Skelter.”

And another from Twitter:

And from YouTube:

On Saturday, the former Beatle announced his first live dates of the year would be in Japan in April.