It should really only take a single viewing of “Dirrty” to make you realize that Christina Aguilera is a natural born risk-taker After all, the pop star pretty much pioneered the whole dip-dyed ends hair trend and swimsuits being considered as legitimate pieces of apparel On Monday night on The Voice she put it on full display, debuting a head full of pastel purple locks tied into a metal hoop-pierced braid