Socialite Paris Hilton has hit out at U.S. Republican presidential candidate John McCain after he used her image in a political advertisement to attack Barack Obama without her authorization.

The controversial commercial, which was aired for the first time on Wednesday, accuses Obama of becoming a celebrity. Images of him flash up on screen alongside Hilton and Britney Spears, while a narrator says: "He's the biggest celebrity in the world, but is he ready to lead?"

And Hilton has blasted the McCain camp for using her image without asking for permission.

A spokesperson for the star says, "Miss Hilton was not asked, nor did she give permission for the use of her likeness in the ad and has no further comment."

Hilton's parents, Rick and Kathy Hilton, contributed a reported $4,600 to the McCain campaign just this year.

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