Jennifer Lopez delivered a show-stopping performance at last night's AMA's, which included three costume changes and lots of getting down on the floor. However, one of Jenny from the block's costumes looked like it had been around the block--specifically on Britney Spears circa 2003. Britney's sparkly nude look in her video for "Toxic" caused quite a stir and now so has J.Lo in this very similar look. Needless to say, they both looked fantastic in this thing that no one should really be able to pull off ever. But, who do you think wore it better?