Gone, but never forgotten. Lisa Marie Presley revealed her bittersweet reminder that she and late son Benjamin will always be connected. The singer paid tribute to Benjamin on the two-year anniversary of his death with a throwback photo of the matching tattoos they'd gotten for Mother's Day. "It’s a Celtic eternity knot. Symbolizing that we will be connected eternally. We carefully picked it to represent our eternal love and our eternal bond," Lisa Marie explained in her caption.