The "Keeping Up With The Kardashians" star, 18, was enjoying a bite to eat with boyfriend Tyga, 25, at Nobu in Malibu when her stepsister and father, who was known as Bruce Jenner before undergoing a gender transition, showed up, reported Female First.
She captioned a photograph of herself and Caitlyn on Instagram, "How is it that Caitlyn, Kourtney, and I ended up at the same restaurant tonight? Perks of having a huge family. (sic).