The troubled rapper and his estranged wife Tashera Simmons have agreed to appear on the upcoming reality show in the hopes of getting their failed marriage back on track, a source close to production tells us.

The Simmons separated in July 2010 after 20 years and four kids together … yet they are still best friends, insists the source – and that's why they want to give it another shot.

We're told DMX feels Tashera is "one of the only people [he] truly ever loved and has been down with him through thick and thin."

The thin? DMX cheated on his wife left and right – and even fathered six children during his extra-marital conquests.