Photo: SplashNews.com

Actor Sylvester Stallone took the stage at his brother Frank’s headlining show at the Hard Rock Hotel and Casino in Atlantic City on Friday night. Sly’s wife of 25 years recently filed for divorce. Pictured: Sylvester Stallone,Frank Stallone Ref: SPL5337193 030922 NON-EXCLUSIVE Picture by: SplashNews.com Splash News and Pictures USA: +1 310-525-5808 London: +44 (0)20 8126 1009 Berlin: +49 175 3764 166 photodesk@splashnews.com World Rights,

Sylvester Stallonewas upbeat and enthusiastic onstage during a recent concert with his brother, musician Frank Stallone, amid his divorce from wifeJennifer 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, “InRocky IVwe 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.

Never miss a story — sign up forPEOPLE’s free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

SplashNews.com

Actor Sylvester Stallone took the stage at his brother Frank’s headlining show at the Hard Rock Hotel and Casino in Atlantic City on Friday night. Sly’s wife of 25 years recently filed for divorce. Pictured: Sylvester Stallone,Frank Stallone Ref: SPL5337193 030922 NON-EXCLUSIVE Picture by: SplashNews.com Splash News and Pictures USA: +1 310-525-5808 London: +44 (0)20 8126 1009 Berlin: +49 175 3764 166 photodesk@splashnews.com World Rights,

After the group’s opening act, Sylvester came back onstage and introduced his brother with warm remarks.

“Hey, I’m here on a mission. I’m here to deliver the message. Okay? Now, I’ve been very, very lucky in my life, but my brother, who really has more talent than me, is about to lay it all on you, you know, so I’m the messenger of good news,” he said. “I want you all to give it up for Frank the tank, my incredible brother.”

During his set, Frank walked the audience down memory lane with stories about his experiences working on music forStaying Alivein 1983 and movies from theRockyfilm series.

Some of the tracks he performed included “I Do Believe in You” from his 1983 debut album, and “Carry On” from 2014. He also performed “Peace in Our Life” from 1985’sRambo 2, which he dedicated to military veterans, given that he wrote the song about the Vietnam War.

Frank also informed fans at the concert that some of his performance was being taped for the Stallone family’s upcoming Paramount+ reality show.

Want to get the biggest stories fromPEOPLEevery weekday?Subscribe to our new podcast, PEOPLE Every Day, to get the essential celebrity, entertainment and human interest news stories Monday through Friday.

He later told the audience that he had surgery while in town for the performance after a severe nosebleed. Frank explained that he took the stage despite having the surgery because he never misses gigs.

The star also gave a shout-out to all of his fans in the audience from Philadelphia, where the iconic Rocky Balboa statue is located.

“It’s wonderful that my brother was here,” he said while thanking his band and executives at the Hard Rock casino, as well as fans, which included those mostly over 55 and a decent amount of younger fans.

A child, with his parents, was dressed in a Rocky Balboa boxing robe, which caught Frank’s attention from the stage.

To wrap up the almost three-hour show, Sylvester came back out hand in hand with his brother to a standing ovation from the crowd. “Sly, you got the feeling?” Frank said over the music, pointing a microphone in his brother’s direction. “I got the feeling,” Sylvester said in response.

RELATED VIDEO: Sylvester Stallone Denies ‘Intentional Dissipation’ of Marital Assets in Jennifer Flavin Divorce

Sylvester’s outing with his brother came about after Flavin, 54, filed for divorce from the star in a Palm Beach, Florida, courthouse on Aug. 19.

A Hollywood source, who has spent time with the couple, recentlytold PEOPLEthat Stallone and Flavin “are very different people, age-wise and in temperament. What was once exciting and challenging is now routine and irritating.”

“His apparent impetuousness could be a problem, a Flavin source also told PEOPLE. “He tends to do things on a whim without asking her before.”

But Stallone is fighting Flavin’s claim. His legal teamrespondedto her divorce filing Aug. 29, stating in court documents that the actor “has not engaged in any conduct which constitutes intentional dissipation, depletion and/or waste of marital assets.” He is also contesting her sole use of the house.

source: people.com