British singer-songwriter Jessie J broke out in 2011 with her debut album ‘Who You Are’. Dance-pop hits like ‘Price Tag’ helped earn her a coveted gig performing at the 2011 MTV EMA in Belfast, plus three nominations. This year, she took the stage at two more massive concerts watched around the globe: In June, she dueted with will.i.am at the Queen’s Diamond Jubilee. And in August she belted out ‘We Will Rock You’ with Queen at the London Olympics closing ceremony.