Hilary Duff has left the building. The actress has concluded her run on Gossip Girl as Olivia Burke and there are no plans for her to come back this season.

That much was kind of expected after this week's episode and the aftermath of the now-infamous threesome. Olivia doubted Dan's feelings for her and left NYU.

But here's some other couples scoop E! Online just unearthed:

* Dan and Vanessa, as foreshadowed in "The Last Days of Disco Stick," are most definitely on. They will be getting together this season.
* Ditto Nate and Serena, who will become a bona fide couple.
* Rufus and Lily will have a major problem (Serena's father).
* Chuck and Blair will be going strong.