When Kourt's out of town -- the Lord is being a good boy!

Kourtney Kardashian wore some sexy skintight leather pants as she arrived at Paris Charles de Gaulle airport for Paris Fashion Week on Wednesday night.

For the international flight, Kourtney donned black leather turtle neck top, which she revved up with a skintight pair of sexy leather pants. Meow! The mom of three, who was sans kids, paired the look with a pair of black boots and a chocker.

The next day, Kourt went gold all the way and dashed off to meet Kim at the Balmain show on Thursday -- and she definitely was not wearing pants. Oh la la!

Meanwhile her estranged ex, Scott Disick, was in Los Angeles lunching with a guy friend on Wednesday. No lunches with mystery lady friends for this reality star!

On Wednesday, Scotty, who was dressed in shades of grey, got lunch with a pal at Rosti Tuscan Kitchen in Calabasas. Looks like the LD is on his best behavior even when Kourt's away!

The father of three managed to stay mum when we asked him about another couple on the rocks, Angelina Jolie and Brad Pitt.