Wednesday, August 29, 2012 5:13am ET by  
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Trailer for Adam Lambert Pretty Little Liars episode emerges

A trailer for Adam Lambert's cameo episode of Pretty Little Liars has appeared online.

The vocal powerhouse signed up to appear in a Halloween special of the US TV series, with filming taking place in July.

He seemed to be a hit on the show's set, with co-star Lucy Hale tweeting at the time:

"@adamlambert I officially love you."

A short trailer for the episode has now emerged online, which sees Lambert performing live to an enthusiastic mass of revellers on what looks like a train.

The full episode is scheduled to air in the US on October 23.




Watch the trailer below: