Jessie J: 'Who's Laughing Now'

For those in their immediate post-teenage years, it's become standard practice to be befriended on Facebook by those snarky kids from your academic years - you know, the ones who routinely poked fun, got better grades and want to find out if they've still got one-up on you. One person unafraid to put such culprits in their place is Jessie J - who, after a seemingly awkward childhood, is in the dream to position to have a pop at them.

"'Cause I'm in LA, you think I've made my fame/ FB makes us friends when you only really know my name," she blasts between squeaky cartoon-styled vocals not heard in pop music since Daphne & Celeste ran riot the charts. Flanked by pounding hip-hop kick-beats and twinkling piano pinches, Ms. Cornish rightfully addresses all those hanger-ons with diva ad-libbing perfection. Young adults of tomorrow, you have been warned.

Watch Jessie J perform 'Who's Laughing Now' at this year's Glastonbury: