"It is with great sadness that my marriage to Sam Poueu is ending," Stephanie told People. "Thank you in advance for respecting our privacy during this difficult time."
The couple met on the hit NBC weight loss show in 2010 during Season 9 and tied the knot in April 2012.
Sam miraculously recovered from horrific injuries after falling four stories from an apartment building roof deck in San Francisco in September 2011 with Stephanie nursing him back to health during his challenging 3-month recovery.
The couple's baby is due in two months time and although they are divorcing, no papers have yet been filed.