If you were thrilled by the news that that a Pretty Little Liars spinoff is in the works 鈥 intriguingly deemed Pretty Little Liars: The Perfectionists 鈥 then you don鈥檛 want to miss out on these juicy details from the show鈥檚 star Sasha Pieterse.

Pieterse, who will reprise her role as Alison DiLaurentis in the spinoff, revealed to Entertainment Tonight that the new series has actually been in the works for over a year. 鈥淚鈥檓 a good secret keeper, come on! On that show [PLL] for seven years? I know what to do,鈥 she quipped.

She also said that she hasn鈥檛 stepped onto the new set yet, but expects to do so sooner rather than later. 鈥淚 think early next year we start filming, which will be very fun,鈥 she told ET of the Freeform series, which will also star Janel Parrish as her PLL character Mona Vanderwaal.

Asked by ET if any of the other PLL ladies will be showing up, Pieterse teased, 鈥淚鈥檓 sure that they will. We have to keep the PLL family alive, obviously鈥︹

The season 25 Dancing With the Stars contestant also gave fans a little info on where we鈥檒l be jumping into the action this time around. 鈥淚 don鈥檛 want to get in trouble, but I think it鈥檚 a year or two [after the PLL finale],鈥 she told Entertainment Tonight. 鈥淗onestly, I鈥檓 so glad that we鈥檙e kind of picking up where we left off. We left it in such a good place and I鈥檓 excited to be a mom, hell yeah!鈥

As fans surely remember, we last saw Alison and Emily (Shay Mitchell) together and raising twin girls, Lily and Grace. And it looks like the little ones will be a part of the spinoff.

However, there is the one tiny fact complicating the situation: Mitchell is set to star in a different I. Marlene King-produced series, The Heiresses. But Pieterse doesn鈥檛 think it鈥檒l be a problem.

In any case, she鈥檚 happy to get the chance to continue to do what she loves, and with a character she loves. 鈥淸Alison]鈥檚 amazing and I think, honestly, you鈥檒l see a little bit more of a feisty side of her now that she鈥檚 in another element that she鈥檚 not used to,鈥 she shared.

We can鈥檛 wait!

Are you excited for the Pretty Little Liars spinoff? Let us know @BritandCo!

(Photos via Freeform/James White + Freeform/Eric McCandless)