The Biebster + holidays? Why didn't someone think of this sooner?! The boy wonder knows how to get you in the festive mood. And we do mean mood: Things get downright naughty on "Christmas Eve." The classics are craftily reworked (Santa comes to town with hip-hop swagger; the drummer boy goes clubbing), and the originals are finely tuned to show off Bieber's surprising range, from dubby coffee-shop pop to soulful country. Plus, a bunch of fabulous guests stop by, including Usher, Boyz II Men and, yes, Mariah Carey. Mistletoe's no Mimi holiday album -- yet. But it's one heck of a holiday party.