Catherine Zeta-Jones is one doting step-grandmother. The 50-year-old actress took to her social media account on Thursday to share an adorable snapshot of her stepson Cameron Douglas’ daughter, Lua. The two year old hammed it up in the picture modeling a pair of sunglasses and a bucket hat. "My love,” Catherine sweetly wrote on the image with heart emojis. “Lua Douglas. Rockin' it!!!"