Charles may be a long lost DiLaurentis, but that doesn't mean Alison knows any more about A than her Pretty Little Liars' cohorts.

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Season 5 came to a shocking end when it was revealed that 'A' was merely an alias for Charles DiLaurentis. When season 6 picks up, Charles' alleged little sister will be none the wiser about his existence.

"[Alison] has no clue who this person is," Sasha Pieterse [Alison] told She Knows, explaining that, as an cast member, she is equally befuddled. "Not everything is written yet. You know, we're still in the process of filming, so I'm kind of in the dark about that, too. And I enjoy finding out all these different secrets that are coming about."

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All Pieterse knows for sure is that her character is definitely NOT masquerading as Charles. When viewers find out who is, however, they will be in for a shock.

"It's going in a super cool direction [that] fans aren't necessarily expecting," Pieterse teased.

Who do you think Charles is? Sound off in the comments below!

Find out more when Pretty Little Liars returns to ABC Family on June 2. Click the video below to see a sneak peek for the season 6 premiere, "Game On, Charles."