House (8:00 p.m. EST, FOX)

One of my favorite actresses makes a guest appearance on tonight’s episode. Laura Prepon plays a blogger who has been admitted to the hospital with unexplained bleeding and bruising. She uses her blog to track her symptoms and possible diagnoses, as well as venting about the doctors who are treating her. She also asks readers for advice regarding her treatment, which is unsettling for the House team of doctors…especially after Wilson (Robert Sean Leonard) and House (Hugh Laurie) learn secrets about one another’s past online.

The Bachelor: Jason and Molly’s Wedding (8:00 p.m.

EST, ABC)

Isn’t it funny how a man (Jason Mesnick) can change his mind so quickly? Jason was “The Bachelor” in 2009, and he rejected Molly Malaney at the final rose ceremony. Not too long afterwards, Jason decided he made a mistake and asked Molly if she would take him back. Here we are, a year later, and the couple is ready to exchange wedding vows in Palos Verdes, California. 2008 American Idol contestant Jason Castro as well as musician Gavin DeGraw are scheduled to perform at the momentous event.

Gossip Girl (10:00 p.m. EST, CW)

On tonight’s episode, Serena (the gorgeous Blake Lively) and Nate (Chace Crawford) consider advancing their relationship to more than just friends, while Vanessa (Jessica Szohr) and Dan (Penn Badgley) try to forget about Dan’s profession of love. Meanwhile, Blair (Leighton Meester) is worried when she realizes that Chuck (Ed Westwick) can’t stop thinking about the mysterious woman he saw at his father’s grave. Good drama tonight, folks!