Which MTV Star Flashed Her Rock Hard Abs on Twitter? (PHOTOS) Share Tweet Remind Me To Watch Reward Me 2 of 2 Previous Autoplay Next July 31, 2012 at 06:00PM EDT by Lindsay Dreyer Related: Teen Mom, Guess Who?, Season 4 Episode 3 full size Credit: Instagram It's 16 and Pregnant's Mackenzie Douthit! We'd know those abs anywhere! They belong to blonde bombshell Mackenzie Douthit, our resident Southern belle and cheerleader extraordinaire. Are you looking forward to seeing more of this athletic lady on Teen Mom 3? To play more "Guess Who?", click here!