Gerard Butler is His Mystery Girlfriend's Knight on Halloween

Gerard Butler and his mystery girlfriend stay close while attending Treats! Halloween Party with Absolut Elyx in partnership with Utsinger Entertainment at the Los Angeles Theatre on Friday (October 31) in Los Angeles.

The 44-year-old Scottish actor was joined at the star-studded party by Robin Thicke, Michelle Rodriguez, Mark Salling, and Ryan Seacrest.

PHOTOS: Check out the latest pics of Gerard Butler

Leonardo DiCaprio reportedly came in a gorilla mask and hung out in the private VIP room where he mingled with Zac Efron, who brought his girlfriend Sami Miro.

20+ pictures inside of Gerard Butler and his mystery girlfriend at a Halloween party…