Scott Disick Mwahahaha ... My Plan's Working

12/9/2015 2:29 PM PST

Scott Disick wasn't smiling on the outside at lunch with Kourtney Kardashian -- but he's gotta be grinning inside, because it looks like his plan to win her back is working.

The estranged couple went on another lunch date Wednesday in Calabasas, but this time they brought a chaperone ... their daughter Penelope

Scott and Kourtney have been spotted out together a bunch since he wrapped up his inpatient rehab stint. As we told you, Disick's dumping his Bev Hills party palace ... partly to show Kourt he's serious about cleaning up his act.

The lord shall return.