Laura Dern is thinking of her late mom, Diane Ladd, on what would have been her 90th birthday. "Happy birthday to my hero, the most extraordinary person I have ever known, on what would be her 90th today," Dern, 58, wrote via Instagram on Saturday, November 29. "As an artist and human being, you were always loving, always dreaming, always creating, and ever in service for all." She concluded, "I love you, Mom." Alongside the tribute, Dern shared a black-and-white throwback photo of Ladd posing for the camera.