Where are my 'Beliebers?' Tonight is the night Justin Bieber does double duty. Unless you have been living under a rock, you should know that The Biebs will be hosting and will also be the musical guest on Saturday Night Live. According to sources, anything goes on the show tonight, nothing is off-limits. From his break-up with Selena Gomez, to his weed smoking scandal and everything in between that the teenage heartthrob has done recently. Here is a promo of what to expect tonight on NBC at 10:30: