Hollywood star Christian Slater has thanked his girlfriend Tamara Mellon for making him the happiest he has ever been. The actor began dating the Jimmy Choo founder last year (07), and concedes the pair's relationship has helped him achieve a new level of contentment. He tells British magazine Closer, "She's a phenomenal woman. She's fantastic, really fabulous." Last year, Slater and Mellon refused to confirm their romance - instead insisting they were 'just good friends'.