Preview Clip of Pretty Little Liars Season 3, Episode 13: The Little Liars Get a Musical Surprise (VIDEO)

Air date: October 23, 2012.

The Pretty Little Liars Season 3 Halloween episode (Season 2, Episode 13: ”The First Secret”) is just a few weeks away (it airs on Tuesday, October 23), and this new sneak peek should make you more excited than ever.

In this clip from the episode, the Liars walk into a Halloween bash (it's on a train, 'cause why not) only to find American Idol star Adam Lambert performing "Cuckoo" — and yes, it's really Adam! Surprise!

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