Blake Lively Blake Lively

Don't you know? Serena is, like, so Season 5.

That is, according to the new promo for the upcoming sixth and final season of Gossip Girl, which shows our favorite Upper East Sider (Blake Lively) being called "Sabrina" by new beau Steven Spence (7th Heaven's Barry Watson). But how long will it be before the truth comes out about Serena?

7th Heaven's Barry Watson to romance Serena for Gossip Girl's final bow

As longtime series villain Georgia says, "everyone gets exposed."

Plus: See who is getting slapped! Who is getting it on? And who is getting... married?!

The final season of Gossip Girl starts on Monday, Oct. 8 at 9/8c on The CW.