Khloe Kardashian is still including her ex, Tristan Thompson, in their kids' lives. The 39-year-old reality star took to Instagram on Thursday to share several photos from her and Tristan's son Tatum's first birthday party. The mother of two shared behind-the-scenes shots from the lavish soiree, which featured massive blue-and-white balloon displays, a large planet print with the little cutie's name on it, a massive astronaut cake, a beautiful star-and-moon floral display, custom astronaut helmets for the younger guests, bracelet-making stations and more.