Gwyneth Paltrow is celebrating her son Moses' 20th birthday 💕 "You are the definition of a gentleman - kind, intelligent, thoughtful and soulful. It’s beyond words how incredible you are. I’m sending you a big birthday hug from the west coast. Don’t forget to check the mailbox today. I love you to bits, mama ❤️" the actress, 53, wrote. Gwyneth shares Moses with her ex-husband, Chris Martin. 📸 : #GwynethPaltrow