If you have HBO or Showtime, tonight's your lucky night — even moreso if you have both! One of Showtime's new signature series wraps up its first season tonight, while new seasons of acclaimed dramas begin on both Showtime and HBO.

First, the finale: United States of Tara's first season ends tonight, with Tara preparing to face head-on the man she believes to be the cause of her dissociative identity disorder. This show has really grown on me since its premiere, almost more for the supporting characters (especially Tara's kids, Kate and Marshall) than for Tara or her alters. It's already been renewed for a second season, so I'm curious to see what tonight's episode wraps up and what it leaves up in the air for the next batch of episodes.

Meanwhile, The Tudors returns for its third season on Showtime, and In Treatment starts its second on HBO. In Treatment is operating on a different schedule this year, with the five therapy sessions airing over two nights (Sundays and Mondays) instead of five, which I hope makes it easier to keep up with the show. The Tudors comes back with some new wives entering the life of Henry VIII, and of them, I'm most curious to see Joss Stone's acting debut as Anne of Cleves.

So: What are you watching tonight? To watch previews for In Treatment and The Tudors and the awesome opening credits for United States of Tara, just read more.

Photos courtesy of Showtime and HBO