For people too lazy to check the wiki:

Team 1:
Helen Kim (Big Brother USA)
Evelyn Smith (The Challenge)
Tiffany Michelle (The Amazing Race/ Worst Cooks in America)
Nikki Grahame (BBUK/BBCAN)
Mitchell Olson (Survivor)
Emmett Blois (BBCAN)
Jessie Godderz (BBUSA)
Will Champlin (The Voice)

Team 2:
Stephanie Valnecia (Survivor)
Rachel Brown (The Amazing Race)
Tiffany Pollard (BBUK)
Amanda Brown (The Voice)
David Shelton (Worst Cooks in America)
Kevin Campbell (Big Brother USA)
Spencer Bledsoe (Survivor)
Juan Pablo Glavis (The Bachleor)