Arnold Schwarzenegger, 75, parties with girlfriend Heather Milligan, 47, and his sons at Oktoberfest

Arnold Schwarzenegger celebrated Oktoberfest in Munich, Germany, on Saturday, with his younger girlfriend Heather Milligan and his sons Patrick and Christopher. The Expendables star was joined by his sons Patrick and Christopher and his nephew Patrick at the event Buttoned-up: His son Patrick Schwarzenegger wore a light blue button-down shirt and green shorts to the event More color: His brother Christopher wore a plaid pink shirt and matching shorts to the beer-soaked evening Patrick's partner: His son Patrick brought his own girlfriend, Abby Champion, to the event Arnold's longtime love Heather stunned in a navy dress over a white shirt. Heather is a physical therapist by trade Going strong: The couple have been together since 2013 Festival time: The Hollywood star also was spotted enjoying Oktoberfest on Sunday in Munich Making memories: Christopher and Patrick joined their famous father at Munich Oktoberfest Popular guy: Arnold posed for a photo with a fan at Oktoberfest on Sunday The Austrian-born father-of-five is the lead in the Netflix series Utap, which has been filming throughout Ontario, Canada, since spring and, according to production listings, should be wrapping up soon. Arnold appeared to sing some kind of song during the festivities Happy couple: Arnold was joined this year by Heather, who also participated with him in 2018 when they celebrated his son Patrick's 25th birthday Big group: A number of the attendees posed together Party time: Arnold seemed to be living his best life once on his return to Oktoberfest A meal and beers: Arnold and his sons enjoyed a meal and beers in the beerhall Close: The couple sat next to each other on the day and appeared close The plot centers around a father and daughter who have worked as CIA Operatives for years. In Traditional dress: The 75-year-old actor wore a traditional embroidered leather to the event New projects: The Austrian-born father-of-five is the lead in the Netflix series Utap, which has been filming throughout Ontario, Canada, since spring and, according to production listings, should be wrapping up soon In good spirits: Heather waved to crowds and beamed as she stood next to her man Last month, the duo was seen on set in what looked like a high-adrenaline scene as they held handguns and searched outside a Catholic Church.