Lou proved her talents at the 2001 Eurovision national finals, taking third place. Shortly before Christmas 2002, composer Ralph Siegel asked her if she would be interested in competing in the national finals again with a song he had written with lyricist Bernd Meinunger. After hearing "Let's Get Happy", Lou was totally enthusiastic: "This is just my kind of song—and besides, it’s my life’s motto...!"Her March 7 win in the 2003 national finals qualified her to represent Germany at the international level in Riga. Ultimately, she placed 11th in the Eurovision Song Contest 2003. In March 2006, she made a guest appearance at that year's German Eurovision preselection, singing "Let's Get Happy" in a medley of past German Eurovision entries.