Adam Lambert
Adam Lambert
Adam Lambert will appear as himself on the Halloween episode of ABC Family's Pretty Little Liars and perform two songs in the episode, according to The Hollywood Reporter.

Lambert appeared on stage in Wicked. He recently released Trespassing, his second studio album -- following For Your Entertainment. Lambert gained international fame as the runner-up of season 8 on FOX's American Idol and is reportedly considering being a judge on the show next season.

The series, which focuses on four friends who band together against an anonymous foe who threatens to reveal their darkest secrets, stars Troain Belassario, Ashley Benson, Holly Marie Combs, Lucy Hale, Laura Leighton, and Chad Lowe.