'Basketball Wives' Star Tami Roman -- My (Not) Fat Ass Got Me a Fat Bank Account

"Basketball Wives" star Tami Roman traded in her large behind for some large bills -- because a diet company offered her a SIX FIGURE endorsement deal after she shed 25 pounds using their product!!!

Sources close to Tami tell TMZ she got all the way up to 185 lbs recently and was determined to lose the weight. She started exercising her booty off, ate healthy food ... and began using a product called NV Sprinkles -- where you sprinkle powder on your food to make you eat less.

We're told Tami dropped the weight in about two months and was so vocal in the press about the NV's help in her speedy weight loss, the company actually approached her to be the face of the product.

Our sources say Tami signed on for a mid-six-figure endorsement deal and all she has to do is keep the weight off.