About
Theresia Fischer (born 31 March 1992, Hamburg) is a German model and reality-TV personality who first burst onto national screens during the 14th season of “Germany’s Next Topmodel” (GNTM) in 2019. Standing at 1.84 m (just over 6′) after highly publicised leg-lengthening operations, she has become as well known for her towering stature and candid interviews as for her catwalk smile. Viewers later watched her trade the runway for the “Promi Big Brother” house, where she finished in fourth place the same year.
Before Fame
Raised in Hamburg, Theresia says she was a chatty child who often felt out of place because of her quirky style and love of older music. After leaving school she began studying Protestant theology and history, hoping to teach one day, but the lecture hall soon gave way to photo studios when local photographers spotted her energetic personality. Early modelling castings were a confidence boost, yet she also spoke of harsh bullying over her appearance—experiences that sowed the seeds of later body-image struggles.
Trivia
- Headline-grabbing surgery: At 24, she underwent two limb-lengthening procedures, adding a total of 14 cm (5.5 in) to her legs at a reported cost of around €146,000. The process involved telescopic rods in each shin and months of painful physiotherapy. In 2024, she revealed the operations left her with periosteum inflammation and lasting regret.
- Wedding on live TV: During the GNTM finale, Heidi Klum officiated a symbolic on-stage ceremony in which Theresia said “I do” to film-producer Thomas Behrend—one of the show’s most talked-about moments.
- Social-media favourite: Her humorous takes on body image and dating have attracted more than 140k Instagram followers and a growing TikTok audience.
- Reality-show marathon: Beyond GNTM and “Promi Big Brother,” she has popped up on “Battle of the Reality Stars” and other German formats, carving out a niche as the exuberant wildcard contestant.
Family Life
The on-air wedding to Thomas Behrend did not last. By 2022, Theresia had left the relationship, describing it later as “toxic,” and rekindled an earlier romance with Hamburg dentist Stefan Kleiser, who is 26 years her senior. She has spoken openly about juggling feelings for both men for nearly three years before choosing a fresh start with Stefan. Family, she says, keeps her grounded: in 2025, she paused social media updates while caring for her seriously ill grandmother, telling fans she “needed quiet time for loved ones.”
Associated With
- Heidi Klum – Host of GNTM, who arranged Theresia’s headline-making on-stage vows.
- Janine Pink – Winner of “Promi Big Brother” 2019 and a frequent house-ally-turned-rival during Theresia’s stint on the show.
- Thomas Behrend & Stefan Kleiser – Key figures in her personal narrative, often referenced in interviews about love and self-worth.
