Sylvester Stallone‘s domestic disputes were put to one side on Sunday as the actor made a welcome appearance at the Italian Grand Prix in Monza.

The actor, whose separation from wife Jennifer Flavin, 54, was confirmed in August, was in a buoyant mood as he made his way across the paddock for an informal chat with the Red Bull team.

Sporting a casual black T-shirt and jeans,  Stallone, 76, looked relaxed as he greeted onlookers before introducing himself to Red Bull Racing Team Principal Christian Horner, the husband of Spice Girl Geri Horner.

In attendance: Sylvester Stallone’s domestic disputes were put to one side on Sunday as the actor made a welcome appearance at the Italian Grand Prix in Monza

The musclebound star, best known for his role as punch-drunk boxer Rocky Balboa, playfully placed a clenched fist beneath Horner’s jaw as the pair posed for a photo.

Stallone was one of several public figures in Monza on Sunday, with actor Hugh Grant and celebrity chef Gordon Ramsay  also in attendance at the Autodromo Nazionale.

His appearance at the event comes just weeks after Flavin, his wife of 25-years and the mother of his three daughters, filed for divorce.

Greetings: Stallone joined Red Bull Racing Team Principal Christian Horner for a photo at Autodromo Nazionale Monza ahead of the Italian Grand Prix

According to divorce documents obtained by DailyMail.com, she claims Stallone ‘has engaged in the intentional dissipation, depletion and/or waste of marital assets which has had an adverse economic impact on the marital estate.

‘Moreover, the Husband should be enjoined from, selling, transferring, assigning, encumbering, or dissipating any assets during the pendency of proceedings.’

Jennifer, who took her husband’s last name, is also seeking to restore her maiden name, Flavin.

Low-key: Sporting a casual black T-shirt and jeans, Stallone looked relaxed as he greeted onlookers while making his way across the Paddock

Ripped: Sylvester put his bulging biceps on show in his fitted T-shirt as he put on an animated display chatting to fellow racegoers

‘I love my family. We are amicably and privately addressing these personal issues,’ Sly told DailyMail.com in a statement via his publicist.

However Flavin said in divorce docs: ‘The marriage between the parties is irretrievably broken.’

The former couple married on May 17, 1997 at the posh Dorchester Hotel in London, and with Stallone’s reputation as a playboy, few predicted they would last long.

All over: Jennifer Flavin has filed for divorce from Stallone after 25 years of marriage

‘I’m not naïve about what may go on when I’m not around – he’s a 45-year-old man – I can’t change the way he is,’ Flavin told People at the time.

‘Still, he’s not a cheating dog every day of the week,’ she added. ‘We spend five out of seven nights together, so I don’t know where he’d find the time.’

But last it did and just this May they celebrated their silver wedding anniversary. The marriage produced three daughters, Sophia, now 25, Sistine, 24, and Scarlet, 20.

He also had two sons with first wife Sasha Czack, Sage, who died of coronary artery disease in 2012 aged 36, and Seargeoh, 43.

Family: The marriage produced three daughters, Sophia, now 25, Sistine, 24, and Scarlet, 20