Adam Lambert may be continuing to ride the crest of a successful post-"American Idol" wave, but a new lawsuit claims the singer violated the competition's rules when he appeared on the reality series. According to the Hollywood Reporter, Lambert faces a new lawsuit that alleges he previously had an "operating agreement" with recording label Welsford Music Productions at the time he auditioned for "Idol" in 2008, thereby putting him in breach of the TV show's eligibility requirements.