Not only is mom-of-four Kim Kardashian, 40, celebrating Mother’s Day on May 9, but it’s also her youngest son Psalm West‘s second birthday! The KKW Beauty mogul paid tribute to the littlest member of her brood with an adorable IG pic, and a touching message. “My Taurus baby Psalm. He turns 2 today on Mother’s Day. Such a special day to share together,” she began. “He’s my child that looks most Armenian to me like my grandpa and reminds me so much of my dad.”