Bethenny Frankel has revealed the surprising secret behind her changing face - she gets Botox injections in her jaw.

The Real Housewives of New York star and Skinnygirl mogul made the revelation in an exclusive interview with DailyMail.com following speculation she's had invasive plastic surgery.

The 45-year-old admits her appearance has changed dramatically in recent years, but says it's a result of getting treatment for teeth grinding and clenching.

'I do look different. I’ve had Botox in my jaw,' she said at DailyMail.com's 2016 Newfront in New York. 'You can see that my jaw has completely changed.'

Changing face: Bethenny Frankel, pictured left in New York last week and right, in 2013, has revealed her jawline has softened as a result of Botox injections used to treat teeth clenching and grinding

'About three years ago, my dermatologist said to me, why don't we try injecting your jaw because it’s so tense,' she explained.

The treatment relaxes muscles that have become bulky through being overworked from years of teeth grinding and clenching, also known as bruxism.

It has soften her once strongly defined square jawline and altered the shape of her face.

'My jaw from grinding for so many years was like this,' she says, holding her fist tightly to illustrate. 'It’s like a muscle, it’s like working out with weights.'

She's pleased and 'excited' by her new look, noting: 'I think it’s why I can take a shorter haircut.'

VIP guest: The Skinnygirl mogul joined DailyMail.com's columnist Piers Morgan at the 2016 Newfront in New York on Thursday

Bethenny said her dentist had been advising her to wear a night guard for more than 15 years. She finally started wearing one about eight years ago, and it helped 'calm' her clenching.

But it wasn't until she had Botox that the overdeveloped muscles in her lower face started to change.

Bethenny, who has previously admitted to having a boob job, also said that she occasionally gets injections elsewhere on her face to address wrinkles.

'I don’t do it religiously,' she says. 'Maybe once a year when I think of it, l’ll be like, oh I look like a Shar Pei, let me do that.'

But she shot down claims she'd gone under the surgeon's knife for major work on her face.

‹ Slide me › 'I do look different': The reality TV star and Skinnygirl mogul admits her once square jawline has been softened by the injections, and she's pleased with the results

'I have not had invasive plastic surgery, I have not had a nose job,' she said.

Alongside her role on RHONY, Bethenny is continuing to build her SkinnyGirl empire, which includes books, cocktails, snacks and now protein shakes.

She has her own two-hour weekly radio program, B Real with Bethenny, on Andy Cohen's Sirius XM channel, 102.

She also has her own TV production company and executive produces the FYI Network show, Food Porn.