Craig Barritt/Getty Images for Stella Artois
June 07, 2017 05:22 PM

There’s no friends and family deal when it comes to Pretty Little Liars plot secrets.

Star Shay Mitchell – who has portrayed tormented high schooler Emily Fields since 2010 – tells PEOPLE that after all these years, she doesn’t even spill secrets about the series’ infamous twists and turns to her relatives.

“My mom is always trying to guess what’s happening and she threatens me a lot of the time if I don’t tell her what’s going to happen,” says Mitchell, laughing. “I never do!”

The 30-year-old – who hosted the Stella Artois Braderie at New York City’s Hudson Mercantile on Tuesday night as a partner of the beverage company’s Host One to Remember campaign – says her mother and grandmother are “100 percent” the biggest fans of Pretty Little Liars in her family.

“They watch it both on the West Coast and the East Coast so they see it a couple of times in one night,” says Mitchell.

Even as Pretty Little Liars nears its series finale later this month, Mitchell says, “I’m keeping my lights tightly sealed” on one of the last remaining mysteries: who is villain A.D.?

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Still, she’s gotten used to entertaining theories – which she tells PEOPLE have yet to border on ridiculous.

“Anything can happen,” she admits. “There’s never really been anything that’s been so crazy because it is Rosewood and we’ve had a lot of crazy moments.”

Pretty Little Liars airs Tuesdays (8 p.m. ET) on Freeform.

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