Adam Lambert heads to 'Pretty Little Liars' for Halloween

"American Idol" runner-up Adam Lambert is set to guest star on an upcoming episode of "Pretty Little Liars," ABC Family confirms. The singer tweeted, "Yup--- imma be a Pretty Little Liar!" on Thursday.

Fans can expect to see Lambert in the series' Halloween episode -- and if it's anything like last year's Halloween special, we're certainly in for a treat.

Lambert will be starring as himself, naturally. He'll perform two songs at a theme party that the liars attend in Rosewood. (How come he never shows up to our theme parties, huh? Consider yourself invited, Adam!)

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