"Thank You Baby! " is a song by Canadian singer Shania Twain. It was released as the fifth single from her fourth studio album Up! on August 11, 2003. It was one of two singles, along with "Ka-Ching!", to be exclusively released to Europe. The song was written by Twain and her then-husband Mutt Lange. It was announced onstage by Twain that "Thank You Baby!" would be the next single from Up! at her Kilkenny concert, her first concert since the Come On Over Tour ended in December 1999.