I just wanted to put all the spoilers we have known so far about Derena. I got them for tumblr and for pages like Perez Hilton or Spoilers Guide =)

-In 6x05 Dan and Serena have a long talk and their sex tape gets released

-In 6x06 they ride a vespa and get stuck in a elevator
Plus: Dan is spotted by Blair buying chocolates and she's pretty mad

-in 6x07 they're in Serena's room with candles and champagne

-in 6x10 they (possibly) Married!