According to RyanSeacrest.com, Lambert will appear in a special upcoming Halloween episode of the ABC Family drama. In the episode, taping next week, Lambert will share the screen with star Lucy Hale and perform two songs.
Lambert, 30, has been in the news in recent weeks as a possible new Idol judge to replace the recently departed Steven Tyler and Jennifer Lopez.
Pretty Little Liars airs Tuesdays at 8/7c on ABC Family. What songs do you think Lambert should perform on the show?