The Insider.com

I'll be upfront about this: Spencer Hastings has long been my least favorite pretty little liar.

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In a sea of feather earrings, sapphic urges and cupcake binges, her ever-rotating hat collection and need to play mommy never sat well with me.

But all that changes in the January 2 mid-season premiere as Spencer not only makes some major personal sacrifices but becomes much more proactive in taking down her enemies. And first on her list is Jarett (the couple nickname for Jenna & Garrett).

Since you've all been such good little boys and girls, I'm gifting you with an exclusive sneak peek at one of Spencer's sensational smackdowns from the season premiere. Watch and get excited because the Pretty Little Liars season premiere is hands down the show's most exciting, revealing and tension-filled episode, ever!

Pretty Little Liars premieres Monday January 2 at 8 p.m. on ABC Family.