What the heck is Serena's secret? What is the deal with Jenny's boyfriend? Will Blair triumph in her quest for social glory?

We'll find out tonight in "All About My Brother." Here are a few more videos from the episode. First, Serena thinks she's in the clear, but Georgina is making her move - on Dan - as Vanessa looks on...

[youtube]http://www.youtube.com/watch?v=LC0vliiW0GM[/youtube]

Follow the jump for another clip from "All About My Brother," in which Dan gets protective of Jenny, saying Asher is coming on too strong...

[youtube]http://www.youtube.com/watch?v=EA7Ej6cj58s[/youtube]

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.