Pretty Little Liars Speculation: What's Alison’s Big Secret?

According to this sneak peek of Pretty Little Liars Season 2, Episode 18: "A Kiss Before Lying," this week there's a "big reveal involving Ali [Sasha Pieterse]" that brings the Little Liars closer than ever to "A." Marlene King called the reveal "shocking and filled with mystery and fun," which obviously leaves us salivating for more info. Sadly, we think we'll have to wait until the episode to find out the truth, but that doesn't mean we can't speculate about what the juicy secret is. In that...


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