Sylvester Stallone's beloved underdog hero, Rocky Balboa, hails from Philadelphia (better known as the City of Brotherly Love). That's a concept that Sly is very familiar with, because when he started making movies, he invited his brother Frank along with him. Frank paid tribute to his big brother at the 48th Kennedy Center Honors, performing "Take You Back" (the street corner song he wrote and sang for the iconic 1976 film 𝘙𝘰𝘤𝘬𝘺). Watch more of this incredible moment on December 23 at 8 p.