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Arnold Schwarzenegger's son Christopher shows off huge weight loss while out with family

Arnold Schwazenegger's son Christopher looked almost unrecognisable after his huge weight loss, during a dinner with his famous family.

The 24-year-old, who is the son of movie star Arnold, 75, and ex-wife Maria Shriver, 66, rocked a more slender frame while out for his brother Patrick's 29th birthday with his parents and siblings, as well as brother-in-law and action hero Chris Pratt, 43.

Christopher kept it casual in a grey shirt and blue joggers as the well known brood were spotted on Sunday evening at restaurant Nobu in Malibu.

He has been steadily losing weight since 2020, by exercising and cutting out junk food.

Christopher attended his elder brother's birthday dinner, with a more slim build (AGEM / BACKGRID)
Christopher pictured at Los Angeles airport in 2016 (GC Images)

The glamorous family were pictured gathered outside the eatery and chatting, with Predator star Arnold wearing a tropical print shirt, blue blazer and cream coloured trousers.

Maria wore a simple white dress with blue trimmings, and a printed long, summer jacket, and trainers. She was photographed speaking to her daughter Katherine, 32, who is married to, and shares two daughter with, Marvel actor Chris.

Christopher graduated from the University of Michigan in May 2020, which motivated him to get into shape and make healthier choices, according to a source.

Christopher's weight loss was clear as he enjoyed his brother's birthday celebrations with his famous family (AGEM / BACKGRID)
The 24-year-old lost weight through cutting out junk food and exercising more (GC Images)

“He made it his goal to get healthy for graduation and he stuck to it,” an insider told HollywoodLife.

They went on: “He started working out and making better food choices. He was away at school living like a typical college kid for a few years, but he’s growing up now and ready to take better care of himself.”

The source added that Christopher didn't use a "fad diet or crash diet" but rather cut out junk food and started working out.

Christopher's dad and brother Patrick, also an actor, commended his on his fitness regime as they wished him a happy birthday.

Arnold Schwarzenegger wore a colourful shirt and blue blazer to the dinner for his son Patrick's birthday (AGEM / BACKGRID)
Arnie's daughter Katherine is married to Guardians of the Galaxy actor Chris Pratt (Getty Images)

The iconic body builder wrote: "Between your boxing classes, your weightlifting classes, your stretching classes, your cycling classes, and on and on, I can’t even keep up with you!"

Moxie actor Patrick wrote: "Proud of you. New job. Crushing in the gym. Whole new person. Can’t wait to see what this year brings."

Arnold and Maria share four children, Katherine, Christina, 31, Patrick and Christopher.

Arnold has a third son Joseph Baena, 24, who he shares with the family's former housekeeper Mildred Beana, after the pair had an affair.

Mildred was reportedly pregnant with Joseph at the same time Arnold's ex-wife Maria Shriver was expecting their fourth child.

Joseph is an aspiring actor and bodybuilder, but also works as a real estate agent.

"I needed a job, and I was not getting any of the acting roles that I thought I was going to get.

"I was like, 'I need to do something', so I started interning at this real estate company," Joseph told Unwaxed Podcast.

Earlier this month, Joseph was announced as part of the line-up for Dancing with the Stars, America's version of Strictly.

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