1. Arts & Entertainment

What to Watch: <i>Gossip Girl</i> Centennial

Gossip Girl, 8 p.m., CW: New York was so enamored with the 100th episode of this series, Mayor Bloomberg called last Friday Gossip Girl Day. And to think, there was never a King of Queens Day.

SEASON FINALE Next Great Baker Finale Pre-Show, 8 p.m., TLC: The cooking show so intense, its finale needed a warmup show. The finale airs immediately after, if you haven't already died from anticipation by then.

SEASON PREMIERE Tosh.0, 10 p.m., Comedy Central: Daniel Tosh comes back with another season of vomit and embarrassment. More clips of your dog, please.

SERIES PREMIERE Key & Peele, 10:30 p.m., Comedy Central: Sketch comedy from comics hoping to capture the market left behind by Dave Chappelle.

Super Bowl's Greatest Commercials, 8 p.m., CBS: Years' worth of ads that ended up being better than the games they were sponsoring. Until the last few years, when expectations were built so high, no commercial could live up to the hype.

SEASON FINALE The Exes, 10:30 p.m., TV Land: The best original show on TV Land not called Hot in Cleveland ends its first season with Holly trying to make her ex-fiance jealous. That ship sailed a long time ago, hon.

Grey's Anatomy, 9 p.m., ABC: After Owen called Cristina a baby killer two weeks ago, the show decides to take a week off and be a little more light-hearted.

SERIES PREMIERE I Just Want My Pants Back, 11 p.m., MTV: Some Brooklynite in his 20s runs around the city looking for the girl with whom he had a one-night stand. Easy, dude. Just go out with another girl and you'll run into her on accident. Happens every time.

SEASON PREMIERE Who Do You Think You Are?, 8 p.m., NBC: This season explores the familial past of Marisa Tomei, Blair Underwood, Reba McEntire, Rob Lowe, Helen Hunt and, tonight, Martin Sheen.

The Life & Times of Tim, 9 p.m., HBO: Tim goes leaf-peeping in Vermont with Amy and Stu and Stu's new girlfriend. The Vermonters are already rolling their eyes.

Joshua Gillin,