Kim Kardashian is Suing Old Navy

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There is only ONE Kim Kardashian -- and now she's declaring a legal war on Old Navy for using a Kim K look-alike in a recent ad campaign.

Kim is filing a lawsuit against the clothing giant  -- claiming they intentionally used a look-alike in an effort to dupe the public into thinking Kim was affiliated with Old Navy. Kim is especially furious that Old Navy has been tweeting to her page about the look-alike -- in an effort to gain even more publicity.

One of those tweets read, "@CBSNEWS reports that Old Navy's Super CUTE star looks like @kimkardashian. #LOL. What do you think?"

Kim thinks the copycat campaign has damaged her wallet somewhere in the range of $15 to $20 million.