Kellie Pickler returns to American Idol Thursday night (April 5) to perform "Where's Tammy Wynette," a track from her latest album, 100 Proof. She was a finalist during the show's fifth season. Pickler's tour includes stops in Albuquerque, N.M., on April 12 and at the Country Thunder music festival in Florence, Ariz., on April 13. Her next single is the title track of 100 Proof.