Not only did the hilarious actor diss Justin Bieber on Twitter after his infamous arrest a few months ago, but he just slammed him during a TV interview too. During Seth's guest appearance on Watch What Happens Live, the funnyman further addressed his post-arrest, "Bieber is a piece of s**t," comment.
"In my opinion, Justin Bieber is a piece of s**t," he said again, but this time on the live show. "He's obnoxious, he's ungrateful, he's insincere. He puts people's lives in danger."
That's not the only thing Seth let out of the bag. He also pullled a Lindsay Lohan and revealed a list of celebs he's smoked marijuana with and you won't believe who is on it. Find out in the clip below.