JT on SNL, week on Fallon

NETWORK SUIT AND TIE: If you really like Justin Timberlake--and if you don't, what's wrong with you?--you'll want to keep your TV tuned to NBC in March. The RCA megastar will host Saturday Night Live on 3/9, then spend an entire week "chatting and performing" (as one teaser has it) on Jimmy Fallon's show (3/11-15). The Fallon stint represents a first for any artist. Something else JT-related is happening around that time, too, right? Oh, yeah: his The 20/20 Experience streets 3/19. Of course, if you can't wait until next month, here's the man's performance of "Mirrors" on yesterday's BRIT Awards. (2/21p)