Elena knows. Stefan is aware. Fans have been discussing it in our Vampire Diaries forum and everywhere online:
It's all over for Stelena.
But Damon will hear this news for the first time on Thursday's "My Brother's Keeper." How will the man who has desired Elena for so long react? In a mature, rational, respectful manner... until Stefan comes right out and tells him to stop pretending. This is clearly the best day of Damon's life.
Watch these brothers interact over their shared love now and let the countdown begin to the 2012 Miss Mystic Falls pageant: