Country music star Keith Urban has opened up about being a judge on 'American Idol' and revealed that he finds it very stressful because it can really impact the lives of those who audition.

Speaking about being a panelist, the singer explained that he always wants to be constructive although it's hard to be honest on television because he doesn't want to humiliate anyone:

"It is not easy for us a lot of the time because we are just coming from a different place. We're artists talking to a young artist on camera in front of millions of people, trying to give constructive criticism in a way that doesn't humiliate them. I don't ever want to humiliate somebody."

Urban, who sits alongside Randy Jackson, Nicki Minaj and Mariah Carey, added that sometimes he can tell when contestants won't be able to handle the criticism he needs to give them:

"Sometimes they are in a particularly fragile state. You can just see it. They are not ready for [criticism] to be delivered to them and I am going to defer in that situation. Someone else, it might look like they are listening. Then let's talk about why [the performance] wasn't so good and they're receptive to that. I am trying to find balance always."

Watch Urban chat to Ellen DeGeneres about his 'American Idol' experience here: