A miracle vibrating bra that can permanently increase the size of a woman’s breasts by one cup size without surgery is being trialed in America, Daily Mail Online can reveal.

Serbian inventor Milan Milić, 30, claims the device enlarges breasts, makes them perkier and brings them closer together - in just seven days.

And if the astonishing bra passes rigorous clinical tests it could help millions of women around the world achieve a larger cleavage and dispel with painful breast augmentation surgery.

Former engineering student Milan began researching alternatives to breast surgery after his girlfriend told him she wanted bigger breasts.

The security guard spent months researching the subject as a hobby before making a prototype of his vibrating bra.

And now he has brought the device - called the E bra - to the U.S. where two American women have become the first to trial it outside of Europe.

The bra, which has only just been patented, has been tested on several women in Europe with staggering results, and the U.S. tests have proved equally as successful; in one trial in Miami - overseen by a specialist doctor - a 49-year-old woman saw her breasts increase from a B to a C cup after she wore the bra for just 15 minutes a day over seven days.

Plastic surgeon Dr. Michael Salzheaur, who independently trialed the bra, meticulously measured and took photographs of tester Sabrina Molinar - and confirmed that her breasts increased in size after wearing it.

Stage hand Sabrina, from West Palm Beach, Florida, who spoke to Daily Mail Online before and after the trial, said her breasts had gone up by around a cup size after wearing the bra for five minutes, three times a day, for seven days. She is adamant that no other factors contributed to the increase.

Delighted Sabrina said: 'I was a 36B before but now I think I'd be a lot more comfortable in a C cup although I haven't been out to buy any new bras yet. I've always had one breast smaller than the other because I had surgery.

'My left one is kind of squashed now in a B cup whereas my left one which used to be small in a B cup totally fills it out. It feels fuller, more full from the top to the side.

'I notice it most when I'm sleeping - I wake up and go, "Oh my boobs they hurt," because I'm not used to having them so I get uncomfortable.

'I definitely feel like I fill clothes a little better and it feels good. If I give somebody a hug I have to accommodate for them - it feels different and I'm just not used to them yet. There was a definite change for me.'

And for any skeptics who doubt whether the undergarment is responsible for the physical change, Sabrina insists that the increase in breast size has nothing to do with her monthly cycle or weight gain - it's all down to the bra.

'Nothing was influencing it other than the bra,' she said. 'I'd love to try the bra out again to see if they will go even bigger.'

Pre-med student Andrena, from Miami, also tested the bra back in May and saw her breasts grow from 32B to 34C.

She confirmed to Daily Mail Online that her breasts have stayed the same larger size even three months after the trial.

Andrena, who asked for her last name to be withheld, said: 'Obviously I was skeptical at first because it seemed too good to be true but after I used the bra it was just amazing - I've had to purchase new bigger bras and everything.

'Plus they've stayed the same which is what I was worried about - I thought it might just be a temporary increase. As for wearing the bra there were no side effects - it did itch a little bit but its not uncomfortable. It kind of tickles and itches but that's it and as it's only five minutes a time so you don't mind.

'I would totally recommend this to friends. I wouldn't want to go under the knife but something so non-invasive like this is just incredible. I feel great now - a lot of my clothes especially shirts didn't fit fully before but now I fill the shirt.

'I feel confident because I feel like I'm wearing the outfit and it's not wearing me.'

Florida-based plastic surgeon Dr. Salzhauer - also known as Dr. Miami - oversaw Sabrina’s test and confirmed her breasts had enlarged. He is now calling for a rigorous clinical trial with a larger sample size to prove the device's effectiveness.