Ramona Singer has angered her “own” company that sells hair extensions made from human locks — by being a diva.

In January, the “Real Housewives of New York” star announced she was launching the brand and that getting the extensions into stores would be a “major storyline” on the Bravo show. But it seems that relations between her and the founder have soured.

In a blistering email, Victoria Flores, who set up the Lux Beauty Club before bringing Singer onboard, seemingly ended their short-lived business relationship last week because of what she called Singer’s “diva behavior,” at one point railing, “You are not Angelina Jolie!”

A source said Singer wanted “to shake up the hair industry” and would be “trying to get [the cast, including Carole Radziwill and Bethenny Frankel to] try the hair.” But apparently things didn’t go as planned.

In the email telling Singer that “any agreement we had, written or verbal, is null and void,” Flores complained that Singer had been a let-down at a promotional appearance at beauty store Harmon Face Values.

“We were incredibly disappointed with your attitude at Harmons and our [return on investment] on you has been less than overwhelming,” wrote Flores. “I can’t build a business with someone that fights me on everything I need them to do, and I want to partner with people that care about my business and are not motivated by blinding greed. This isn’t working out for me anymore.”

She added, “You have been nothing but disrespectful . . . We would have never agreed to bring you on as a Brand Ambassador if we had been [a bigger company] . . . I would have given [a household name like] Rita Ora a part of my company, NOT Ramona Singer.”

By Sunday tempers had settled, and Singer told us she was planning to sit down with Flores to work out their differences. “I can’t be fired as I have a signed contract that last [sic] 2 years . . . With no termination Clause,” Singer emailed. “They are severely undercapitalized and can not afford to pay what is owed to me. I have fullfilled [sic] all my contractual Obligations.”

Neither Flores nor Bravo got back to us.