One source claims the 18-year-old was actually bullied for being there -- apparently not everyone thought she earned the right to walk the shows!
The insider spilled:
Miz Katy Perry made her presence known on the red carpet at the Costume Institute Gala with a high cut pink dress that lit up!
We like the light up concept, but the dress is a little Barbie goes to prom meets Pretty Pretty Princess.
[Image via L Gallo/WENN.]