The 25-year-old actress posted a touching quote from the Antoine De Saint-Exupery book "The Little Prince.”
It says, "You - you alone will have the stars as no one else has them... In one of the stars I shall be living. In one of them I shall be laughing," it read. "And so it will be as if all the stars were laughing, when you look at the sky at night... You - only you - will have the stars that can laugh."
She ended it with, "I love you. I miss you. I'll try to keep looking up. Z."
Williams’ last Instagram post was on July 31, wishing his daughter a happy birthday with a touching black-and-white photo of Zelda as a toddler.