Katy Perry's new look.The «Roar» singer and judge stunned with a striking black 'do — in stark contrast to the bright blonde looks she's been serving up all season.Perry's long black locks stole the spotlight, and the songstress paired the new style with a big, bold golden cross necklace and an animal print top that truly came together to wow fans.While many tuned in to see which of the Top 24 would be making it to the Top 16 — and which eight hopefuls would be getting the axe — fans couldn't