Patrick & Arnold Schwarzenegger: Father-Son Sunday!

Patrick Schwarzenegger heads back to his car after hanging out with his dad Arnold on Sunday (October 30) in Beverly Hills.

The 18-year-old model and student at Brentwood High School went to lunch with his pop at a family favorite restaurant, Cafe Roma.

PHOTOS: Check out the latest pics of Patrick Schwarzenegger

Arnold has just signed on to star in the upcoming action film Black Sands, Deadline reports.

In the film, Arnold will play “a loner who wages war against a ruthless weapons manufacturer and his private army in the Southwest.” Production is set to begin in April of 2012.