Parks & Recreation (8:30pm, NBC) - Leslie finds out Tom is getting divorced from his hot Canadian green-card wife, so she plans a night out on the town to cheer him up.
Private Practice (9pm, ABC) - There are two new back-to-back episodes tonight. Stephen Collins (left) guest stars as Addison's father, and Violet makes Addison angry by sleeping with him. In the second episode, JoBeth Williams shows up as Addison's mother, and shares a devastating family secret.
30 Rock (9:30, NBC) - It's the first episode of Liz Lemon's "Dealbreakers" talk show, and Jack connives to make it a hit. Will Arnett and Sherri Shepherd guest star.
It's Always Sunny in Philadelphia (10pm, FX) - Dee gets a part in an M. Night Shyamalan film, and Mac and Charlie seize the opportunity to pitch the director their script -- which they haven't yet written.