Audrey Middleton, who will be one of the houseguests on the upcoming "Big Brother," was not always Audrey ... she was born Adam. TMZ has learned Audrey will become the first transgender on the U.S. version of the show, and she plans to use the program as a showcase ... similar to what Caitlyn Jenner has been doing. Audrey grew up in a small Georgia town as a boy, and life was far from easy. We're told when she transitioned several years ago, her family had a hard time accepting it, but they're now fully supportive and on board. Read more: http://www.tmz.com/2015/06/16/big-brother-welcomes-first-transgender-house-guest/#ixzz3dMQcH9vk