The supermodel has asked the 3am girls to track down the lookalike who is trying to cash in on her fame.
She says she is "furious" and "extremely concerned" after hearing reports of the fake's shocking behaviour around London's showbusiness circuit, because she's been getting the blame.
Naomi, 36, was angry when she found out that fake Naomi phoney tried to gatecrash Oasis's £80,000 star-studded party to enjoy free booze and food.
Fake Naomi's wig and cheap coat didn't seem right with the doormen at the Cuckoo Club in London's West End. She was begging to get in, but was rejected.
At Mariah Carey's Pinko Cocktail Party in London's Knightsbridge the real Naomi told the Mirror:
"Girls, you gotta find this impostor for me. Who is she, who is she? I can't believe she's masquerading around town as me. I wasn't even in London on Wednesday during the Brits as I was on a modelling shoot in Paris. "I'm relying on you girls, you gotta get this into the paper so we can catch her. It's not right."
Mariah, 36, was there to support Naomi.
"No one's as fierce as you girl, there's only one Naomi Campbell", she told her.
When Naomi was banged in the face by a photographer she laughed it off, saying: "I know I'm hardly one to talk, but that hurt."
Naomi, nine assault claims to her name in the last eight years.
That morning, Mariah wore a pair of diamond-encrusted Pinko denims laced with 22-carat gold thread - worth £10,000 - the most expensive ever.
"They are pretty fabulous. A girl can never have enough bling after all," she said.