Nicole Kidman, the successful Australian actress and mother of four, recently posted a photo on Instagram in honor of Earth Day, flaunting her toned legs at the beach. She wore a long shirt that highlighted her legs and accessorized with a straw hat. The second photo in her carousel showed two of her little ones running along the same beach. Nicole shares two kids with Keith Urban and has two adopted children with ex Tom Cruise. She is currently filming HBO's new series, The Undoing, and will also reprise her role in the second season of Big Little Lies. The Goldfinch, another movie starring Kidman, is set to release in September.