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Last Updated: Tuesday May 04 2010 15:56 GMT

In pics: Katy Perry's glowing gown!

Katy Perry

At first glance Katy Perry's dress looked simple and glamorous...

Katy Perry

But when the lights went out the star lit up the room!

Katy Perry

Katy's dress had rows of fairy lights inside it which made it glow.

Katy Perry

Katy outshone all of the other celebs at the Metropolitan Museum Gala Benefit in New York.

Katy Perry

The lights were powered by a tiny battery inside her skirt.

Emma Watson

Harry Potter star Emma Watson was also at the gala, wearing a very similar dress...

Emma Watson

But Katy's dress was definitely the brightest of the bunch!