Simon Cowell’s brainchild may finally have a worthy winner. After struggling through the first two seasons of this show with unmarketable winners (Melanie Amaro and Tate Stevens), America has finally got it right and crowned indie/folk/pop lovebirds Alex & Sierra the winner of X Factor USA. Mentored by Simon Cowell, the boyfriend-girlfriend college students started the competition with low expectations, but constantly wowed us and evolved week after week. Sierra started as a shy back-up singer for her boyfriend, but in the last few weeks has emerged as his equal. Their last 3 performances have all hit #1 on iTunes, with multiple other performances all hitting the top 10. Never has that happened before for X Factor USA, so obviously Simon is the happiest man in the world right now. Take a look at their winning moment, and some of their best performances to date.