Actress Kristen Bell may have voiced the notorious XOXO "Gossip Girl" sign-off, but in a surprising series finale twist, Dan Humprey aka Lonely Boy, was revealed as the person behind wreaking havoc on the Upper East Side.
He continued, "All I had to compare it to was what I read in books. But that gave me the idea: I wasn’t born into this world… maybe I could write myself into it" -- and that's what he did.
In other news, Chuck (Ed Westwick) and Blair (Leighton Meester) were finally married after six years of drama.
The last scene of the episode took place five years later, flashing to Dan and Serena's (Blake Lively) wedding day.