Bravo TV announced that the mother of one would join Carole Radziwill, Heather Thomson, Kristen Taekman, LuAnn de Lesseps, Ramona Singer and Sonja Morgan in the seventh season of the show, reported Ace Showbiz.
Rumours of her return had emerged a few weeks ago, but she denied it earlier this month.
"I'm genuinely excited, with a side of slightly nervous, for my return to 'The Real Housewives of New York City'," Bethenny says in a statement.
"Bravo has always been the place on television where I have the freedom to be unfiltered, honest and inappropriate, with an audience who has been with me from the beginning. I can't wait to see what this next chapter brings for all of us.