Patrick Schwarzenegger & Sister Katherine Keek Out at Just Jared's Halloween Party!

Patrick Schwarzengger channels Will Ferrell for his Semi-Pro costume at the 2014 Just Jared Halloween Party: “JJ Freak Show” held at No Vacancy on Friday (October 31) in Hollywood.

The 21-year-old actor and model was joined at the event by his sister Katherine Schwarzenegger, who dressed as Jessica Rabbit, as well as lots of other attendees including Gregg Sulkin (dressed as a British Playboy Bunny), Royal Pains‘ Kyle Howard (dressed as Ace Ventura Pet Detective), model River Viiperi (dressed as The Mask), Drake Bell (dressed as a skeleton), 24: Live Another Day‘s Giles Matthey (dressed as a Breaking Bad character), actor Shawn Pyfrom (dressed as Marlon Brando), singer Eli Lieb (dressed as Superman), Insurgent‘s Jonny Weston (dressed as a soldier) and Vampire Diaries‘ Shaun Sipos (dressed as an Eyes Wide Shut character).

The guests all mingled with Just Jared‘s very own Jared Eng, who went as a ringmaster covered in lots of tattoos!

Katherine hit up the Keek booth during the party and had fun with some pals inside! Check out the video below.

25+ pictures inside of Patrick Schwarzenegger and other guests at the Just Jared Halloween party…