Pretty Little Liars Season 4 may not have started yet, but the cast is already prepping for the highly-anticipated Halloween episode.

Troian Bellisario (Spencer) took to Twitter over the weekend, giving us a sneak peek into what's to come this October. Along with a pic of over a dozen braided hair extensions, Troian wrote, "And you thought we already had enough hair on this show. Get ready for Halloween...."We have goosebumps just thinking about it!

As for what's to come in the episode? For starters, we know know that we'll be introduced to three Ravenswood characters in the episode. Costume designer Mandi Line also tweeted, “#pll fans u actually have no clue how insanely AWESOME this HALLOWEEN episode is going to be! The whole #pll team is going to blowurmind!!!”

While we wait for more details on the spooky episode, we know one thing's for sure — the Little Liars will clearly be wigging out this Halloween!

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