Credit: Instagram

While we anxiously await the start of Pretty Little Liars Season 4, the cast and crew are hard at work making the TV magic happen. And we say hard at work, we mean it — yesterday (May 5), they stayed up until the wee hours of the morning filming, and we have the hilarious tweets to prove it.

Late in the night, Ashley Benson tweeted, "It's 1 am and we are only on the second scene. Pulling a 20 hour day with [Shay Mitchell], [Lucy Hale], [Troian Bellisario], and [Ian Harding]." Troian retweeted that message and added, "Stab me in the face." We guess she didn't enjoy the late night action!

Credit: Instagram

The long hours didn't stop the cast from having some fun... Mostly at Ian Harding's expense. Ashley tweeted the photo above, showing Ian sleeping on the floor, writing, "Sweet little angle [sic] sleeping." (Ian replied by pointing out that Ash spelled angel wrong ... like a good English teacher!)

Later, Troian Bellisario tweeted the photo of Ian to the right, writing, "[Ian] captures the 4:18am glare. #stillshooting."

Sounds like a tough night, but we're sure the end result will be worth it!

Find more Pretty Little Liars spoilers here.

Pretty Little Liars Season 4 premieres on Tuesday, June 11, 2013 at 8 p.m. ET/PT on ABC Family.