"I had never seen Magnum. When I first met Tom, I was remembering I had a little crush on him from Friends! I was like, 'This is awkward, he's gonna be my dad.' His vibe is a bit like my own father's, so I felt really comfortable around him and he's the coolest, nicest guy." Katherine Heigl on Tom Selleck, who plays her on-screen dad in new movie Killers.