Credit: Ashley Benson Keek    
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Pretty Little Liars

Ashley Benson and Troian Bellisario Twerk It Out With Mrs. Hastings on Set! (VIDEO)

All work and no sleep drives these Pretty Little Liars crazy! Just when you thought Ashley Benson and Troian Bellisario couldn't possibly top their sleep-deprived antics on set of Season 4, these two Little Liars go and make our favorite behind-the-scenes Keek video yet.

Here's the set-up: Ashley wants Troian to twerk it out for the camera, but Tro doesn't know if she can! (She must be exhausted — or maybe she inhaled too many hairspray fumes.) Troian's twerkin' starts off slow, but Ash was there to give her some much needed encouragement. ("Get it, baby. Get it.") It turns out the only thing Troian really needed to motivate her was a text! Upon the realization that she got a text, Troian begins to twerk at a speed that would suggest she "licked" at least two or three cups of coffee. However, Troian's twerkin' was put to shame when mama Hastings (Lesley Fera) walked on set with so much swagger we mistook her for Beyonce. To quote our girl Ash, "Mommy's twerkin' and she's werkin'."

What's the lesson here, Pretty Little Liars fans? When you get a text, you have to TWERK IT OUT. Watch the hilarious video below for instructions from Ashley and Troian.

Catch the next episode of Pretty Little Liars on Tuesday, June 18, 2013 at 8 p.m. ET/PT on ABC Family.