Robin Williams, who died Monday of an apparent suicide at the age of 63, celebrated his daughter, Zelda Williams’ birthday in his last post to Instagram and Twitter on July 31.

Robin Williams Celebrates Daughter In Final Instagram

Williams, who had celebrated his 63rd birthday only 10 days before, shared an old photo of himself and his only daughter, when she was a baby, to celebrate Zelda’s 25th birthday.

“#tbt and Happy Birthday to Ms. Zelda Rae Williams! Quarter of a century old today but always my baby girl. Happy Birthday @zeldawilliams Love you,” Williams wrote.

Zelda had previously wished her father a happy birthday on Twitter.

So @jackson_heywood turned 26 yesterday, @robinwilliams turns 64 today, I turn 25 on the 31st. Jeez July, you're full!

— Zelda Williams (@zeldawilliams) July 21, 2014

On Monday, Zelda addressed her father’s death on Twitter and Instagram with a quote from The Little Prince and a personal message, writing, “I love you. I miss you. I’ll try to keep looking up, Z.”

Zelda is Williams’ only daughter, but is one of three children. Williams also fathered two sons, Cody Alan Williams, 22, and Zachary Pym Williams, 31.