VIDEO: 10 CELEBRITIES YOU DIDN'T KNOW HAVE MENTAL ILLNESSES

A mental illness is an invisible illness, and we are often surprised when we find out a person struggles with a mental disorder. This is because they usually do their best to hide it as a result of the large stigma against mental illness. 

In our minds, we think mental illnesses are obvious. We think of crazy people having a breakdown at the grocery store. We think of people locked up in asylums with a straight jacket.

But what we don't know is that there are many people that seem as if they have it all together, when they actually don't. One in five Americans suffer from a mental disorder, did you know that?

Did you know that David Beckham suffers from obsessive compulsive disorder? You probably didn't. 

And while some celebrities are open about their struggles with mental illness, others take years before they come out with the truth – and some never reveal it at all.

In this video, we show you 10 celebrities that you probably didn't know have a mental illness.