Reza Farahan Reveals Threesome with Bob Harper

Reza Farahan, star of the reality shows Shahs of Sunset and The Valley: Persian Style, has

Farahan, 52, exposed his 'friends with benefits' fling with the dashing trainer Bob Harper, 60, best-known as a host of The Biggest Loser.

They struck up their dalliance at the gym and remained intertwined for years, though Farahan was more romantically invested than Harper.

Then Harper married a man called Scott and the relationship transformed into a menage-a-trois, with the trainer 'bouncing back and forth' between two men.

Their time as a 'threesome' culminated in a wrenching tragedy that Farahan recounted in his newly published autobiography.

Entitled Memoirs of a Gay Shah: My Story of Family, Fame, and Becoming a King, the book containing the history of their romance hit the shelves this Tuesday. 

Harper and Farahan were first introduced when they were both working as trainers at the same gym, a job that the latter eventually left.

At that point Farahan began taking Harper's classes and they became 'inseparable' best friends, forming a bond that eventually developed a sexual component.

Harper is pictured with fellow trainer Jillian Michaels in 2005 in a season two promotional shot for their series The Biggest Loser, which catapulted them both to stardom