Justin Bieber seems to be playing with fire. The singer wants Seth Rogen to roast him. This will be interesting as Seth has publicly shown some dislike for the biebs. 

Justin, who just turned 21, took up the cause on Twitter, writing, "Seth Rogen, all I want for my birthday is for you to roast me. I took the Twitter bashing please make my bday and do it in person. Thanks."

When the comedian didn't answer, Justin started a hashtag campaign called #WeWantSeth.

The Roast of Justin Bieber will be March 30th on Comedy Central.