In 2001, Petruo became a member of popular German girl group No Angels, which disbanded in 2003. She was the first member of No Angels to launch a solo career. In 2004, she released her first single, "Drama Queen", which reached number 11 in Germany, number 35 in Austria and number 88 in Switzerland. Another single, "Pop That Melody", produced by Mousse T, was planned. The music video was shot but, like "Drama Queen", it was pulled back due to differences in style with "Mama Lilla Would".