It's been twelve years since Justin Guarini was runner-up on the first season of American Idol, and he's finally ready to spill some juicy secrets about his time on the show. According to Guarini, he had secret romantic relationships with two of his co-stars!

Guarini dished the dirt during a performance of his one-man cabaret show, "Lovesick," in New Hope, Pennsylvania, on Valentine's Day.

Most shocking of all, he says he dated Idol champ Kelly Clarkson!

According to one reviewer, Guarini told the audience that he "actually had a serious