Olivia Newton-John died on Monday at the age of 73, and she was remembered as an iconic singer, actress, advocate for cancer research, and a devoted mother to her only daughter, Chloe Lattanzi. On Tuesday, the 36-year-old actress and singer, who's father is Newton-John's ex-husband, Matt Lattanzi, shared a touching video tribute to her "lighthouse mama." The post included behind-the-scenes footage from the recording of their duet "Window in the Wall." "You are my lighthouse mama.