So what went down at Kendall's 19th birthday yesterday? We know that Selena Gomez and Cara Delevingne sang her a very sweet happy birthday. So. Cute. Check it out here. She was spotted out and about at a bday lunch, while her friends and family took to social media to share messages of love. KJ has definitely had a stellar year — after walking the Spring '15 runways for the likes of Chanel, Givenchy, Dolce & Gabbana and Marc Jacobs, we can't wait to see what's next for the model.