Kristen Bell

The 'Frozen' star explained how she was left utterly "debilitated" by depression and anxiety.

In an essay she wrote for Motto, she revealed: "There’s nothing weak about struggling with mental illness. For me, depression is not sadness. It’s not having a bad day and needing a hug. It gave me a complete and utter sense of isolation and loneliness. Its debilitation was all-consuming, and it shut down my mental circuit board. I felt worthless, like I had nothing to offer, like I was a failure. Now, after seeking help, I can see that those thoughts, of course, couldn’t have been more wrong. It’s important for me to be candid about this so people in a similar situation can realise that they are not worthless and that they do have something to offer. We all do."