Sir Paul McCartney delivered a monumental performance for Stephen Colbert’s final Late Show. The 81-year-old icon returned to the Ed Sullivan Theater, eerily echoing The Beatles' historic 1964 TV debut there. Fans are calling it a full-circle moment, a poignant nod to music history. McCartney's appearance marks an unforgettable farewell for Colbert's late-night run, solidifying his legacy with a legendary send-off.