Sharon Osbourne has attacked Nicole Kidman - saying she has a forehead "like a flat screen TV."

The outspoken "America's Got Talent" judge launched a tirade against the actress while hitting out at celebrities who refuse to admit to having plastic surgery, branding them "lying b***hes."

Sharon - who admits she has spent over $600,000 on cosmetic procedures - ranted on U.S. talk show "Chelsea Lately": "Oh my god! Those liars, I hate them, those b***hes. They go, 'Oh no, I wouldn't do anything.' Meanwhile, their eyebrows are here."

"Nicole Kidman's forehead looks like a f***ing flat screen TV - how big is that forehead?"

"If something bothers you, it doesn't make you happy, then change it. What's the deal? I don't get what the mystique is, why people lie about it."

Although experts have previously described Nicole, 40, as an "enthusiastic" user of Botox - which helps to smooth skin and reduce wrinkles - Nicole has always denied having any procedures.

She said recently: "To be honest, I am completely natural. I have nothing in my face or anything. I wear sunscreen and I don't smoke. I take care of myself and I'm very proud to say that."

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