It's good to be Paul McCartney's stepson.

Arlen Shevell just graduated from Rollins College in Winter Park, Florida. Shevell's stepdad just happens to be Sir Paul McCartney.

After the graduation, McCartney attended a private party at the Interlachen Country Club. Josh Walther and The Phase5 Band, hired to play at the party, were ecstatic when Sir Paul jumped on stage to jam with the band.

Watch Paul Mcarthey and The Phase5 Band perform "I Saw Her Standing There."