This isn't the first time katy has performed for President Obama. Back in 2012, she dressed up to Las Vegas rally as a human ballot to support his re-election campaign and now she's performed at the White house on thursday night July 31 at a dinner celebrating Olympics, sparkling in a blue gown designed by Elie Saab from the Pre-fall 2014 collection.
Katy is so hot, you wanna know why?
First she got another opportunity to perform at the white house dinner celebrations which means loooooooots of money.
Secondly, the United States president said she's one of his favourites." We have just one of my favourite people performing tonight-Katy Perry, I love katy Perry and we are so grateful".