Kourtney Kardashian and Scott Disick reunited today for a lunch date -- without the kids -- for the first time we've seen since bad boy Scott left rehab recently.

The estranged partners' relationship was previously ended by Kourtney, but it appears she may be giving Scott another chance. Or discussing how they'll co-parent their two kids, separately ...

Kourtney and Scott arrived together in the Lord's car to Marmalade in Calabasas for a late lunch. Scott was chivalrous and opened the door for Kourt and our photographer on the scene says Kardashian looked "so happy." The pair dined for about 45 minutes and then headed home together.

Does this mean the parents-of-three are back together?