Khloé Kardashian is 34! The reality star celebrated her birthday surrounded by family and friends in her Calabasas, CA, backyard, and we're really wishing our invitations didn't get lost in the mail (darn you, USPS!). Kris, Kim, Kendall, and Kylie were all there for the special occasion, along with Tristian Thompson, baby True, North West, and twin BFFs of the Kardashian-Jenner family, Malika and Khadijah Haqq. The group enjoyed some laid-back poolside fun and photo ops before sitting down for dinner, cake, and a sweet birthday toast from Kylie. In the middle of the shindig, Kim hilariously documented Tristan unblocking her on Instagram — LOL! Keep reading to see all the adorable behind-the-scenes photos from Khloé's casual birthday bash. Oh, and you'll definitely want to check out footage of what happened to Kris once the party started winding down.