Hayden Panettiere has nothing but praise for her ex-fiancé, Wladimir Klitschko — and she let him know how grateful she is to him in a sweet Father’s Day post.The Nashville alum, 30, took to Instagram on Sunday, June 21, to share a throwback photo of Klitschko, 44, holding their now 5-year-old daughter, Kaya. “Happy Father’s Day to this amazing man,” the actress wrote.