Actor and comedian Seth Rogens tweeted something very nasty before to pop-singer Justin Bieber, calling him "a piece of sh*t." The tweet became viral and everyone has been buzzing around Twitter - and he's not taking it back.

Seth Rogen along with Dave Franco appeared on an episode of Bravo's "Watch What Happens Live" at SXSW promoting their new movie Neighbors. The show's host Andy Cohen asked Seth Rogen about the viral tweet on the "Beauty and A Beat" star, Seth Rogen said to the host.

"Oh, it's because, in my opinion, Justin Bieber is a piece of sh*t. He's obnoxious, he's ungrateful, and he's insincere."

"What's worse, he puts people's lives in danger with his horrible, horrible behavior. And overall he acts like a piece of sh*t."

With that being said no wonder the Beliebers hated him so much as enraged fans bashed Seth Rogen with enraged tweets on Twitter.

Justin Bieber was arrested last January for DUI and drag-racing on a Thursday morning in Miami, Florida. He was held after racing a borrowed yellow super-car down a residential street and admitted to authorities he had been drinking alcohol, had taken anti-depressants and had been smoking marijuana all day.

Now, the 19-year-old has been encouraged to seek help by a Canadian radio station. Hot 89.9 in Ottawa is refusing to play the star's music until he gets help and broadcast the message out to their listeners on Thursday.

He left jail after being bailed on charges which includes driving under the influence of alcohol, marijuana and prescription drugs. Later on, Bieber appeared before a judge via video link who set his bail at $2,500.

Several celebrities like Conan O'Brien, Zack Braff, Ellen DeGeneres, Jimmy Fallon and others expressed their say on Bieber's arrest by tweeting on their Twitter accounts.