Justin Bieber is the bullseye of Kevin Hartâs âoperation roast everyoneâs a--!â. The comedian will be on hand to host the âComedy Central Roast of Justin Bieberâ and add a few verbal jabs to his pal. âI donât normally do roasts, but I had to step out for my guy Biebs,â Hart said in a statement obtained by E! News.