ABC Family's Pretty Little Liars is gearing up for one killer Halloween episode. Former American Idol finalist Adam Lambert is set to take the town of Rosewood by storm when he makes a guest appearance in Pretty Little Liars third season.

The Hollywood Reporter confirmed that the Idol will appear as himself in an October Halloween episode. The episode is described as a sequel to last season's Halloween episode, and has Lambert slated to appear in a scene opposite one of our Pretty Little Liars. Lambert is doing more than just making an appearance. The singer is set to perform two songs at a pumpkin-themed party they are attending, reports E! Online.

When we heard Adam was a fan of the show we knew that he would be a perfect fit for our Halloween episode, explained executive producer I. Marlene King to E! Online. He's oh so Rosewood.

Adam Lambert even confirmed the news on his twitter, telling his followers: Yup-imma be a Pretty Little Liar!

Lambert and King aren't the only ones excited about the pretty little opportunity.

Shay Mitchell, who plays Emily on the series, tweeted Lambert, exclaiming: Welcome to Rosewood!

Ashley Benson, who plays Hanna on Pretty Little Liars, responded to Lambert's tweet with:
:)) fun fun fun.

In season two the series had Vampire Diaries star Claire Holt guest star, along with ABC Family's 10 Things I Hate About You actress Lindsey Shaw. Pretty Little Liars is currently in its third season.

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