"Being unashamed of your feminine form makes you strong. It takes strength to accept and love yourself," she wrote. "This is message is for every woman who has ever been called stupid or a bimbo for having confidence and for loving your body. Having big breasts does not make you stupid. It's Calling people stupid for having big breasts that makes you ignorant. I love you all. I celebrate the sexy free confident woman."
In the picture, Lattanzi shows off her toned body in a purple string bikini while standing on the edge of a swimming pool.
Lattanzi is the daughter of Newton-John and her first husband, actor Matt Lattanzi. The pair were married from 1984 to 1995. Lattanzi is an actress and singer who was recently featured with her mother on "You Have to Believe," a reworked version of Newton-John's song "Magic" from the movie Xanadu.