[3] Her father is a dermatologist, and his parents immigrated from Poland to northern France after World War II.

Jablonski has walked for Shiatzy Chen, Donna Karan, Dior, Gucci, Burberry, Yves Saint Laurent, Alexander McQueen, Balmain, Balenciaga, Zac Posen, Sonia Rykiel and Elie Saab, among many others.

She has appeared in advertising campaigns for brands such as Alberta Ferretti, Cesare Paciotti, D&G, Donna Karan, Calvin Klein, Hermes, Nine West, Majestic Filatures, Max Mara, Barneys, Topshop, Tse, H&M, Bally, GAP, Moschino, United Colors of Benetton, Estee Lauder, and Y-3.

In April 2010, it was announced that Jablonski and Chinese model Liu Wen would join the roster of faces of the cosmetics company Estée Lauder.

She has appeared in editorials for French, Japanese, German, Chinese, British, Russian, Italian, American, Teen, Greek, Korean, Spanish, and Portuguese Vogue, Italian Marie Claire, Allure, Harper's Bazaar, Russh, Vanity Fair, American and Korean W, Interview, V, i-D, French and Japanese Numéro.