Sylvester Stallone was upbeat and enthusiastic onstage during a recent concert with his brother, musician Frank Stallone, amid his divorce from wife Jennifer Flavin.

On Friday evening, the actor, 76, joined his 72-year-old brother as he headlined a show at the Hard Rock Hotel and Casino in Atlantic City, New Jersey.

Sylvester was the first to greet the crowd at the show, telling audience members before him, "The bright lights of show biz. Thank you. Thank you. I appreciate it."

Then introducing John Cafferty and The Beaver Brown Band as the show's opening act, Sylvester continued, "In Rocky IV we did a montage that I never thought was possible, and I don't think it's ever been duplicated. I have to thank these men, who put that song 'Hearts on Fire' and drove it to the top."

In addition to "Hearts on Fire," Cafferty and his group also performed a set that included the track "On the Dark Side." He told the audience that Sylvester had called to inform him about Frank's show at the Hard Rock and personally asked him to open the performance