Patrick Schwarzenegger celebrated his 21st birthday in Las Vegas with a number of pals, including his father Arnold Schwarzenegger, over the weekend.

Patrick Schwarzenegger's 21st Birthday

Schwarzenegger kicked off his birthday celebrations with his actor father, sister Christina Schwarzenegger and friends at Strip House at Planet Hollywood Resort and Casino. At the end of the birthday meal, Planet Hollywood International Chairman and CEO Robert Earl presented the budding actor with a custom-designed cake, reported E! News.

On Schwarzenegger’s milestone birthday his father, mother Maria Shriver and sister Christina took to social media to celebrate him bringing in his 21st year.

“Happy birthday to a great son who has grown into a great man, @patrickschwarzenegger,” the Terminator actor captioned an Instagram snap. “I'm so proud of you and I love you. #tbt"

Patrick Schwarzenegger was also sure to wish himself a happy birthday.

Over his extended birthday weekend in Las Vegas, Schwarzenegger shared a number of pictures with his group partying it up poolside and at the clubs.

Schwarzenegger, a model and actor, is the third child of erstwhile couple Arnold Schwarzenegger and Maria Shriver. He is currently starring in a Tom Ford ad campaign with Gigi Hadid and will soon appear on the big screen in Dear Eleanor and Scouts vs. Zombies.