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Bro feud!

Justin Bieber took to Twitter to respond to Seth Rogen's repeated disses yesterday, and the singer was surprisingly calm about all the nasty things the actor has said about him in recent interviews!

The Knocked Up actor called The Biebs a "piece of sh*t" following his arrest for drag racing in Miami, and he has also recounted a few unpleasant meet and greets with the "Baby" crooner on Howard Stern. The Canadian crooner must have gotten tired of being the topic of conversation, because he attempted to silence the comedian with a subtle sassy comment!

"Seth Rogan, sorry I didn't bow down when I asked 2 meet u. Was probably a bit shy and didn't want to be over the top but still. love ur movies," he wrote on his social media account.

We think it's only a matter of time before these two bury the hatchet, because we all know nobody is safe from Bieber fever for very long!