After comedian Seth Rogen slammed pop star Justin Bieber countless times via social media in 2014, it seems the unlikely duo officially made up during Bieber Week in the halls of Ellen.

The This Is the End star took to Twitter after the "Sorry" singer was arrested in January 2014 for drinking and driving. Rogen made his contempt for the Canadian singer blatant with a tweet that read "All jokes aside, Justin Bieber is a piece of shit," which garnered over 210,000 retweets.

According to NME, Rogen further divulged his feelings for the fellow Canadian on Watch What Happens Live, when he explained "In my opinion, Justin Bieber is a piece of sh*t. He seems like he's obnoxious and ungrateful, insincere, and he puts people's lives at danger with his horrible, horrible behaviour, and overall he acts like a piece of sh*t."

The comedian further spoke with Howard Stern of the same topic, saying that Bieber is a perfect example of a person you meet expecting to hate, because once you meet him, you realize you hate him.

Bieber didn't take Rogen's insults in stride, sarcastically apologizing for not bowing down to him upon their first meeting because he was bashful. He further admitted he didn't want to be "over the top" in person and that he loves Rogen's movies.

But, Bieber and Rogen collided at an Ellen show taping earlier this week, as Bieber promotes his new album Purpose and Rogen his new movie, Neighbors 2: Soroity Rising. Rogen did not shy away from his beef with Bieber, telling Ellen DeGeneres, "We had a beef. I called him some really mean things on Twitter. I can't tell you why I did it. It really hurt his feelings, as it should have. A lot of people got very angry. All this time I'd only met him once. I finally saw him today in the hallway of your show. It's all my fault."

The Purpose singer then stormed the stage adorned in a promotion mask from Neighbors 2: Sorority Rising, which sees a cameo from Selena Gomez, as the two settle their beef, shake hands and hug it out.

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