Kourtney Kardashian is always cool as a cucumber ... especially after she's gotten some D from boy toy Younes Bendjima!

The eldest Kardashian daughter wasn't even phased by our questions regarding her brother Rob's legal trouble with his baby mama Blac Chyna, she just keeeept walking, mouth shut.

Of course this isn't the first time the Kardashian family members have had to keep their mouths shut regarding Rob's relationship. From the beginning, they warned him about Chyna's motives and, unfortunately, it took buying multiple luxury vehicles, hundreds of thousands of dollars of jewelry and having a baby before Rob realized they were right ...

Meanwhile, Kourtney had a sly smirk on her face because frankly, all this Rob drama barely even bothers her. She just spent a week with her model boy toy Younes Bendjima in the south of France so she's feeling awesome right now :)