No — reliable public sources do not currently confirm that Thylane Blondeau is left-handed.

Thylane Blondeau is a French model, actress, and fashion designer. Born in Aix-en-Provence, France, on April 5, 2001, she is the daughter of former footballer Patrick Blondeau and fashion designer Véronika Loubry.

Blondeau began modeling at a very young age, gaining significant media attention for her appearances in Vogue Enfants at age four and later for being dubbed 'the most beautiful girl in the world' by the international press.

Throughout her career, she has walked for prestigious designers and brands, including Jean Paul Gaultier, Dolce & Gabbana, and L'Oréal. She also launched her own fashion brand, No Smile, further establishing her presence in the fashion industry.

Beyond modeling, Blondeau ventured into acting, appearing in the 2015 French film 'Belle & Sebastian: The Adventure Continues.' She continues to be a prominent figure in fashion and social media.