'The Voice' live shows: Adam Levine to use a charity swear jar

Adam Levine isn't exactly known for filtering his speech -- last season on "The Voice," he dropped an s-bomb after Christina Aguilera's contestant blew him away. "Beverly, you were so good I s**t myself!" he exclaimed.

This year, he's going to try to watch his mouth, and if he doesn't, it's going to cost him.

"I have a dirty mouth," he told People. "I curse a lot and I want to try to contain that a little bit." To encourage himself and his fellow coaches to mind their language, they're putting a swear jar next to the famous red chairs.

"I'll have a little curse jar next to me. Every time we say a bad word, $100 goes to charity. It will help us, it really will. Because we'll end up giving a lot!"

Blake Shelton's in on it, too. "I'm agreeing to it," he says. "I will sign up."