Celebrity Parents Kourtney Kardashian's Sons Mason and Reign Star in Day 14 of Christmas Card for Their Birthdays "My birthday boys," Kourtney Kardashian wrote alongside the latest KarJenner Christmas card teaser, featuring her sons Mason, 8, and Reign, 3 By Jen Juneau Jen Juneau Twitter Jen Juneau is a digital news writer for PEOPLE. A '90s teen and horror film connoisseur, she started at the brand in 2016, after a decade of working as a technical writer and then moonlighting as a journalist beginning in 2013. Originally from New Orleans, Jen grew up both in NOLA and Florida and eventually attended the University of Central Florida in Orlando (still her home base!), where she earned a bachelor's in English/technical communication, with a minor in magazine journalism. People Editorial Guidelines Published on December 14, 2017 04:31 PM Share Tweet Pin Email The Kardashian-Jenner Christmas card took on a dual purpose Thursday. Kourtney Kardashian appeared alongside her adorable sons with ex Scott Disick in Day 14 of the photoshoot, posted on Instagram. But the cute mother-sons photo op was more than just a new addition to the fun KarJenner advent calendar: It marked both boys’ birthdays, Dec. 14. RELATED GALLERY: See Every Single 2017 Kardashian/Jenner Christmas Card Countdown Photo Reign Aston turned 3 on Thursday and Mason Dash celebrated his eighth year. Wrote Kourtney alongside the photo, “My birthday boys.” Want all the latest pregnancy and birth announcements, plus celebrity mom blogs? Click here to get those and more in the PEOPLE Babies newsletter. Eli Russell Linnetz Kourtney’s sister Kim Kardashian West also posted the image, with a sweet caption dedicated to the boys: “Happiest of birthdays to my two nephews! I love you so much Mason & Reign.” For more coverage, follow our babies magazine on Flipboard. The image doesn’t mark the threesome’s first appearance in the countdown: Both boys were in Day 13 as well as alongside mom and sister Penelope Scotland, 5, in day six. RELATED VIDEO: Kim Kardashian Is Giving Us A Piece Of Their Christmas Photo One Day At A Time The famous family has been releasing their annual card piecemeal since the first of the month. Though Kim, Kourtney, sisters Khloé Kardashian and Kendall Jenner, all their children and mom Kris Jenner have been featured, sister Kylie Jenner has yet to be among those in the denim and white tee-clad crew.