BEFORE THEY ROAST HIM, KEVIN HART AND LUDACRIS GIVE JUSTIN BIEBER The long wait for Justin Bieber's Comedy Central Roast finally ends tonight.Justin is going to be getting a serious "ass-whooping" during the show as roasters -- including Kevin Hart, Snoop Dogg and Ludacris -- make jokes about everything from his relationship with Selena Gomez to his legal woes.Now, we knew that Beliebers would be a bit "disappointed" that their guy was getting a verbal beat-down -- and that's why we decided to ask everyone on the purple carpet to tell us their favorite thing about the pop star."My favorite thing about Justin -- I mean look, he's a young kid that's driven," roast-master Hart said. "He's a young kid that made it through all the obstacles that were thrown in his way.""My favorite thing is how he can be brave enough to do something like this," Luda said. "Because not a lot of people would allow themselves to get roasted."Martha Stewart added that she admires his "youthful impetuousness," while comedian Chris D'Elia really loves this one thing about Justin, purely for selfish reasons:"I mean he's been good to me -- he tweets about me and tells people to listen to my stuff," he said. "So I like that about him."Make sure to watch it all go down tonight at 10 p.m. ET/PT on Comedy Central.