At 16 years old, with blonde hair and a wholesome appeal, Kim Petras is set to be a superstar.

But this is no ordinary girl. Kim, of Cologne, Germany, was actually born Tim.

Last October, just days after turning 16, she had a sex change operation to fulfill her dream of becoming a woman.

According to doctors, Kim is the youngest person in the world to ever have the dramatic surgery.

"There never was a defining moment when I thought, 'I'm not meant to be a boy,'" said Kim, who spoke exclusively to The Sun. "I've lived my entire life as a girl."

Thanks to her campaigning, the legal age for transgender surgery in Germany was dropped from 18 to 16. Kim began hormone therapy at the age of 13 in Hamburg, and made headlines after appearing on a German TV documentary to push for the right to have a sex change.

Dr. Achim Wuesthof, a German hormone specialist for children and teenagers, and his colleagues felt that in Kim's case it was better to start the transition at an early age.

"To the best of my knowledge, Kim is the youngest sex change patient in the world," Wuesthof said. "According to German law, two independent psychiatrists must confirm that the child is indeed transsexual and approve the sex change. Once that has been done, it is best to start as early as possible."

Click here to read more about this story from The Sun and to see before and after photos of Kim.