Nikki Bella's Real Estate Chops -- Showing Off Doorknobs To 'Total Divas' Co-Star

WWE star Nikki Bella is putting her real estate license to work ...she's already hawking houses to "celebrity" clients -- including one of her "Total Divas" co-stars.

WWE diva Cameron -- aka Ariane Andrew -- is looking to buy a place in L.A. with her boyfriend ... so she tasked Nikki with the job of finding her new humble abode.

The duo checked out a bunch of places ... Cameron's leaning towards this pad in Tarzana -- featuring 5 bedrooms, 4 bathrooms and a brand new salt water pool.