Actress Emma Watson was stunned to see how many unworn clothes Paris Hilton had in her wardrobe and believes excessive consumerism is a form of kleptomania.

The 23-year-old actress was shocked when she visited the hotel heiress' lavish mansion to film scenes for her new film 'The Bling Ring' - since Hilton was a victim of the thieving Bling Ring gang in real life.

"It's almost like consumerism as a form of kleptomania. She could never wear all of those clothes and half of them were brand new and still had the price tag on. But I suppose she just bought them to have them. We've all bought things on impulse but that's an entirely different thing," she said.

It appears the Bling Ring gang - who famously stole 2 million pounds of luxury goods from the homes of celebrities in the Hollywood Hills, including Lindsay Lohan and Miranda Kerr - would have been wasting their time had they targeted Watson.

Despite her personal fortune standing at over 26 million pounds, the starlet insists she is far more down-to-earth and would never waste money on unnecessary clothes and accessories. "I've got about eight pairs of shoes and that's it."