Thursday marked what would have been Robin Williams's 65th birthday, and his daughter, Zelda, paid tribute to the late comedian with an emotional Instagram snap. She posted a photo of her herself and her brothers, Zachary and Cody, with their dad and captioned it with a sweet message: "I know I can't give you a present anymore, but I guess that means I'll just have to keep giving them in your name instead." Zelda explained that she donated to a service dog rescue organization in Robin's honor to help "three causes you cared about." See her tearjearking tribute, then look back on Robin's extraordinary life in pictures.