Jana Defi was first published on the web by the Polish erotic website Busty.pl in May 2005. Defi began nude modeling for the website in videos and pictorials. She modeled under different names, including "Maria Swan" and "Princessa". Defi also modeled for another erotic website named McNudes.com. Defi is also a glamour, lingerie, topless, and swimsuit model. Today, Defi is one of the top Czech models and represented by the German agency, Markuslensch.

Much discussion has been given to the nature of her breasts, with a blog presenting its evidence that she has breast implants. A website that hosts her pictures responded to these accusations with testimony from a Los Angeles plastic surgeon and radiologist that her breasts are natural. The video contained not only testimony but a live, unedited sonogram exam of her breast tissue, which showed that no implants existed and that her breasts are entirely natural.

--Wikipedia