Monday, Gossip Girl goes to the prom - and provides us flashback glimpses of the show's potential '80s spinoff in the penultimate episode of the season, "Valley Girls."

The following week, on May 18, the second season concludes with graduation, and Serena attempting to unmask the infamous blogger in "The Goodbye Gossip Girl."

Below are some promotional photos from the season finale. Click to enlarge, and see if you can guess what events take place in this eagerly-anticipated episode ...

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