Kaley Cuocos (40) Daughter Matilda is now a big sister – and this role seems to be enjoying the three-year-old to the fullest. The actress recently shared a snapshot of the siblings in her Instagram story: Matilda sits there with the newborn child on her lap and cuddles her. She gives the camera a wide smile. Kaley added a heart and a loving "sister" to the post – there was obviously no need for more words for this moment.