Sophie Turner says Kim Kardashian's booty isn't real? Oh, snap!

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Australian model Sophie Turner says Kim Kardashian's trunk junk is fake? Girl, you better run!

Spotted in a skin-tight red satin dress, presumably heading to an L.A. nightclub, Turner flaunted her famous, bouncy Down Under derriere for TMZ's cameras.

When told that her back door put Kim's well-endowed rump to shame, she bragged, "Mine's real! It's pure Aussie goodness."

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