Katy Perry divorces Russell Brand, and suddenly she turns from Barbie into a blue-haired She-Ra? I like this raunchier look; it suits her. Perry doesn’t dance as well as her peers, but “E.T.” and “Part of Me” are two of the best pop songs out there right now. Perry has an undefinable It factor that makes it impossible to stop looking at her — and not just because of the skintight outfit. Her performances are always better than I expect.