No one challenged, provoked, entertained and, well, titillated us over the past 12 months quite like Gaga. By Jem Aswad Lady Gaga Photo: Jason LaVeris/ FilmMagic/ MTV News Which stars had the biggest year? All this week, we’ve unveiled our top nine men and women of 2009 — with the winners announced today! It’s been a big year for Taylor Swift , Beyonc
