Yesterday Kourt turned 41, and her family and friends wanted to surprise her by holding a drive-by party, to celebrate. Guests turn up with balloons, posters and streamers in their luxury cards to sing, honk, blast music and make a general ruckus in front of Kourtney’s house. Kendall Jenner, Khloé Kardashian who arrived with Tristan Thompson, Kim Kardashian and her children North and Saint West, and Stephanie Shepard were among those who turned up. And it really looked extremely fun for a birthday party, where you couldn’t even hang out with other people. Also, someone brought a piñata which was supposed to look like Kourtney in a bikini.