Sztella was born on July 27, 1988, in Hungary. She is half Greek on her father's side. She studied communications at her local university and works in the family business, she also went to cosmetology school to become a make-up artist.
She was working as a model when Liz Pelletier stumbled upon some stock pictures of her with then-boyfriend Pepe Toth that had been taken 3 years prior in Budapest in 2009 when Sztella was 20 years old. Together Pelletier and author Jennifer L. Armentrout decided they were perfect for Daemon Black and Katy Swartz, as they fit the vision of how the author had imagined the characters would look like. The couple was unaware the photos had been used for the cover of the book until Pepe spotted the book and e-mailed Jennifer who invited them to the United States to meet her, later on, they filmed the book trailers to promote the series and accompanied the author on a book tour.
She met Pepe Toth for the first time at a birthday party when they were both 12 years old, they met again when they were 14 years old and Pepe asked her out. They began their relationship and got engaged in August 2010 while they were living in Cyprus. However, they broke their engagement some time in 2012 before the release of the Origin cover, which is the reason why only Pepe appears on the Origin and Opposition US covers.
Sztella has graced the cover of more than 62 books together with former boyfriend Pepe Toth and alone. 
Currently, Sztella is married to Istvan Fehérvári, the couple welcomed their first child, a girl named Nara on October 17th, 2018. Their second daughter named Nola was born on January 2nd, 2020. They reside in their native Hungary.
Lux Series work
- Sztella Tziotziosz's site
- @sztellatziotzios Sztella on Instagram
- Sztella on Facebook
- @sztellaT Sztella on Twitter