The German actress has been dating the former Dawson's Creek star since 2006, and she insists seeing a therapist on a regular basis helps keep her personal life happy.
She tells Britain's Marie Claire magazine, "All relationships are hard. It doesn't matter what job you have, or how famous or miserable or poor you are. It's about commitment... When you meet someone, are you ready to make them your number one priority?... I'm grateful that I met a person who feels the same, not just about me, but about our relationship. But therapy helps too."
She adds of her counselling sessions, "It's funny, in Paris (where she has a home), people don't talk about it. My friends ask, 'What's wrong with you?' But here (in the U.S.) everyone talks about it, and I really like that about America. Therapy's not about getting help; it's facilitating yourself to deal better with life in general."