Liljegren sent photos to Danish modeling agency Scoop Models and signed with them to start her career. She opened Balenciaga's S/S 2013 show at age 15. That year, she also walked for brands like Prada, Jil Sander, Valentino, and Louis Vuitton, and appeared in Zara and Missoni advertisements.[2]Elle Macpherson chose Liljegren to model her lingerie collection called Elle Macpherson Body.[3]