I attended Katy Perry's sold-out New York City show. (Photo illustration: Yahoo News; photos: Kelsey Weekman/Yahoo News)MANHATTAN - The little girls twirling in glittery skirts outside of Katy Perry's Madison Square Garden concert don't know her latest album flopped. They don't know how poorly her spaceflight stunt was received, how her quirky persona has been panned as dated or how her split from fiancé Orlando Bloom is being dissected online."I like 'Firework,'" says Ivy, an 8-year-old who's in attendance with her mom and little sister.