Scott Disick, Kourtney Kardashian ... Partying Together In Malibu

Scott Disick and Kourtney Kardashian were spotted together Friday night for the first time publicly since their breakup in July.

The two were in Malibu celebrating the release of celeb pastor Rich Wilkerson Jr's new book. In a video from the party, you can see them standing together ... and Scott looks totally tame.

They weren't the only big names at the event ... Justin Bieber, Patrick Schwarzenegger and Omarion also joined in.

As TMZ reported -- Kourtney has left the door open for Scott -- and we're told he's a completely new person now. Looks like they're starting off on the right foot.