Patrick's mom, Maria Schriver, and his two sisters, Christina and Kathrine Schwarzenegger, came out to show their support at the star-studded premiere of his new film at the Arclight Cinemas in Hollywood on Thursday, and the loving family raved over the 24-year-old actor's first major role as Hollywood heartthrob.
"It's exciting for him, it's so sweet for him. He's such a good young man," his proud mom marveled to ET's Katie Krause on the red carpet. "I feel accomplished. When I see [all] my kids together and happy, I feel accomplished."
While Patrick's younger brother, 20-year-old Christopher Schwarzenegger, wasn't able to attend the premiere due to his school schedule, the 62-year-old NBC News correspondent says the bond between her children is very strong.
"They're four really great human beings and I like that they all support each other with whatever they're doing. So that's a really great thing," said Shriver, who is executive producing Netflix's Take Your Pills with daughter Christina.
Katherine, 28, said the family is "so proud" of Patrick for his achievements, adding with a laugh, "He's a man now, He's an adult."
The young star was also joined by his girlfriend, Abby Champion, who was all smiles as she posed for photos with Schwarzenegger on the red carpet, and received the stamp of approval from his mom.
"I love Abby, she's a wonderful young woman," Schriver shared. "She's terrific."
While Patrick's dad, Arnold Schwarzenegger, was in Australia and couldn't make it to the red-carpet premiere, the action star shared his support on Instagram, alongside a trailer for his son's new film.
"I am so proud of @patrickschwarzenegger!" he wrote in the caption. "I can't wait for his big starring role to hit theaters March 23rd. I love you, Patch! #MidnightSunMovie."
Arnold Schwarzenegger's Hollywood Advice To Son Patrick: Make Money, Keep Money
"My mom and my dad have given me advice on every account, whether that's being a son, a student, an actor, a businessman, whatever it is," he shared. "My dad and my mom always just want me to follow my passion and what I love and write my goals down and utilize every day to make them become a reality."
As for working alongside his father on one of his many upcoming film projects, Patrick says that those talks haven't happened yet. However, he said he's definitely open to the possibility and seeing them both on the big screen together "might happen" in the future.
"He's such a great guy," Schwarzenegger said of the singer. "I'm just really blessed to call him a friend, he's a really great guy… I'm really happy he came to support me and I'll support him throughout his life."
Midnight Sun – co-starring Bella Thorne -- hits theaters March 23.