Lucy Hale and Sasha Pieterse are revealing a few secrets from the second half of Pretty Little Liars' seventh and final season!

ET caught up with the girls, who play Aria Montgomery and Alison DiLaurentis, respectively, during Freeform/ABC's Television Critics Association press day in Pasadena, California, on Tuesday, where they got candid on the series' upcoming musical number.

WATCH: 'Pretty Little Liars' Is Officially Ending After Season 7: 'We're Saying Goodbye'

"Funny enough, neither of us are singing in it," Hale, 27, told ET's Leanne Aguilera. "I'm in the sequence, it's not one of the singers -- well, she is a singer... You'll see, you'll see. It'll make sense when you see it, but it was very fun to shoot."

"It was shot like a music video," she added. "And yeah, something different."

"We were all recording it on our phones," added Pieterse, 20, who confirmed she is not part of the musical number. "It was a really special day, took up the whole set."

As for that one-year time jump? Hale told ET that fans will be treated to a "really cool" two-hour episode.

WATCH: Lucy Hale Assures 'Pretty Little Liars' Fans That Finale Will Have 'Happy Moments'

"That gives us a lot of time to do a lot of things," she explained. "That's the episode where you get the big answer [to] who 'A' is, which is very exciting, and there's a wedding or two or more, whatever."

Pieterse said there's also "a couple of betrayals" this season, noting that "Alison's pregnant."

"It's really cool to see how all the girls deal with that, and how Alison deals with it, and what her decisions are, all that jazz," she dished. "I mean, hey, we thought that she could -- there's nothing more she could do but surprise you!"

Lastly, the girls teased what's to come of Aria's engagement to Ezra Fitz (Ian Harding). When asked if fans will definitely get to see the fan-favorite character walk down the aisle, Hale played coy.

WATCH: Troian Bellisario Marries Patrick J. Adams in Gorgeous Outdoor Wedding

"Are we? We better! I don't know," she exclaimed. "We'll see. I sure hope so. She is engaged, yeah, so…"

Pretty Little Liars returns Tuesday, April 18 at 8 p.m. ET on Freeform. As we patiently wait to watch the final 10 episodes, press play on the video below to see the beautiful pics from Troian Bellisario's real-life wedding to Patrick J. Adams in Santa Barbara, California, last month!

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