Fri, 12 Oct 2012 15:29:54 GMT | By Lucy Mapstone
Katy Perry's a firework at amFAR Inspiration Gala!

Alessandra Ambrosio

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Victoria's Secret model Alessandra Ambrosio smouldered backstage for the roaming cameras. Earlier in the day, she had tweeted to her half a million Twitter followers that she was excited for the amFAR Gala!