Kourtney Kardashian was feeling shy Wednesday as she took son Mason to his weekly music lesson.

The reality star hid behind the arm of her bi-color coat (um, it was 90 degrees yesterday, sista). Mason didn't look so timid -- he stared at the cameras with a confident look, sporting his camouflage Yeezy shirt and his usual gold chain.

It was recently teased that the nine-year-old will be the first Kardashian kid to participate in a Keeping Up With the Kardashians on-camera confessional this season. The episode will air this Sunday and Kim Kardashian calls it "so funny and heart warming." She says instead of a show producer asking questions of Mason, it's Khloe behind the camera.

We can't wait to see it! This kid seems like a total baller with oodles of confidence and what we suspect is a sly sense of humor ...

Meanwhile, Kylie Jenner was feeling a little shy yesterday, too -- but we spotted her in her toasted marshmallow-colored Mercedes G-Wagon, flexing ...