Not only was it about 100 degrees out yesterday, but Kendall Jenner and Kourtney Kardashian were looking smokin' hot when X17 photographers snapped their photo.

On Friday afternoon the sexy siblings stopped by the studio to film Keeping Up With The Kardashians, and Kenny opted for a cool sundress and sneakers while Kourtney wore a pair of high-waisted jeans, heels and a tight tank.

Later in the day Kourt went to Color Me Mine with son Mason, and she also posted some sweet photos on Instagram with son Reign. Of course, what was estranged partner Scott Disick doing? Later in the day he was snapped partying with Kylie Jenner and Tyga. Um, what?! The trio of troublemakers went to at 1 Oak in West Hollywood and left around 2am. While it's not good that he can't quit the club scene, at least he was getting his drink on with some of his extended family? I mean, it could be worse...