The power of celebrity: Quiz Hello! editor, Phil Hall

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The biggest celebrity get-together of the showbiz calendar, the Oscars, is nearly upon us.

This weekend, the mega-stars will mingle and party safe in the knowledge that, perhaps more than ever, their status is power.

Celebrity is the ultimate bankable asset of the modern world. Want to launch a new product, get attention for your cause or turn around an ailing brand? Then engage a celebrity.

Yet celebrity is fickle. One day you're in the A-list, the next you don't even make it into list C.

What is celebrity? What makes and breaks a celeb? And what is their real power?

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