The Vampire Diaries Sneak Peek: How Did We Not Know?!?

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Yup, the Kat is out of the bag.

On The Vampire Diaries Season 5 Episode 15, Caroline will let her friends in on the little secret that Elena has actually been Katherine for a very long time now.

This will lead them all to ask the same question many viewers have been pondering for weeks: How did they not pick up on this?!?

Talk about a major OOPS, huh? Watch the latest sneak peek now:

The CW has also released a number of photos from "Gone Girl."

Watch The Vampire Diaries online if you need a refresher and click through these episodic images now:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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The Vampire Diaries Season 5 Episode 15 Quotes

Katherine is a passenger in Elena, except it's worst… because none of us seemed to notice!

Caroline

If I had known I just had to die to drag your attention from Stefan, I'd have tried it a long time ago.

Nadia

The Vampire Diaries Season 5 Episode 15 Music

  Song Artist
Mr little jeans good mistake Good Mistake Mr. Little Jeans iTunes
Emily wolfe white collar whiskey White Collar Whiskey Emily Wolfe iTunes