Kelly Clarkson never had a wedding – when she got engaged, she ended up eloping because she didn't like to deal with the question of who would walk her down the aisle or join her for the father daughter dance. But Kelly's more than ready to crash a wedding for Stacy, a fan who not only loves Kelly Clarkson's music, but relates to her life experience. Like Kelly, Stacy's dad left when she was young, and not having a father affected her intensely. But finding her fiancé Gabriel, helped Stacy heal. It's a journey Kelly knows well and sings about in her song "Piece by Piece." But Kelly's got to get her own nerves in check to perform "Piece by Piece" as the couple's first dance, before launching a wedding dance party with "My Life Would Suck Without You."