Now that all of the Liars except Aria (Lucy Hale) are aware that Ezra Fitz (Ian Harding) is up to no good on Pretty Little Liars, it's only a matter of time until she learns the truth, too. But when exactly will the beans be spilled — and how will she react when they are?

While we don't have the exact answer, several spoilers give us a very good idea of when we can expect the truth to come out.

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Based on the synopsis for Season 4, Episode 21 (“She’s Come Undone”) it sounds like Aria definitely knows by that point, since it says, "Emily, Hanna and Spencer are concerned for Aria as they watch their friend crumble after learning shocking news about Ezra."

Of course, it's possible that "shocking news" is something other than the fact that Ezra's probably totally evil, but since we know Aria does find out that Ezra is probably "A" this season, we think it's a pretty good bet that that's what the synopsis is talking about. Our guess is that the truth actually comes out near the end of Episode 20 ("Free Fall"), since it's the kind of shocker the writers like to drop at the end of episodes.

Either way, once Aria does learn the truth it's going to be heartbreaking, and a train wreck. As Lucy Hale explains, “You get to see Aria really angry. She's upset about a lot of things. She has pent-up feelings and bottled emotions, and somewhere in the middle of the season, girlfriend just loses it."

We. Can't. Wait.

Are you looking forward to Aria learning the truth? What episode do you think it happens in? Let us know in the comments below!

Rebecca Martin is an Associate Editor at Wetpaint Entertainment and our resident Game of Thrones, Breaking Bad, and genre TV expert. Follow her on Twitter and Google+!