Old Navy is preparing to defend the $20 million lawsuit filed by Kim Kardashian, who alleges that the chain tarnished her reputation by using a lookalike model in an advertising campaign. Old Navy's legal strategy? What reputation! Parent company Gap Inc.'s lead lawyer, Louis Petrich, wants to make the value of Kim's endorsement a key plank of his case. Hint: Old Navy does not think that value is very high. And Petrich is seeking documents that seem calculated to cause the maximum embarrassment to the Kardashian Korporation.