VIDEO: Sneak Peek - Adam Lambert Performs on ABC Family's PRETTY LITTLE LIARS, 10/23

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The Rosewood Halloween Ghost Train is the perfect setting for all of 'A's' tricks and treats, in 'This Is a Dark Ride,' a special Halloween-themed episode of ABC Family's hit original series PRETTY LITTLE LIARS airing Tuesday, October 23rd Musical guest star Adam Lambert ('American Idol') performs his songs 'Trespassing' and 'Cuckoo,' from his latest album 'Trespassing,' during the Halloween festivities. Get a sneak peek at Lambert's appearance below!