Australian supermodel Sophie Turner is trying desperately to take the booty crown from Kim Kardashian -- and Monday night, Sophie even engaged in some serious backside trash talk.
As she flexed her gifted glutes outside a nightclub in Hollywood, Sophie took a shot at her competition saying, "At least mine's real."
For the record -- Kim has always claimed that her butt is 100% authentic.
Butt we gotta ask ...
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