Madelyn Cline has become the face of Reign Storm, serving as their brand ambassador since September 2024. This role includes featuring in advertising campaigns and participating in wellness events to promote the leading zero-sugar plant-based energy drink from Monster Energy.

Madelyn Cline was featured in American Eagle's Spring '22 Members Always campaign, which was launched by American Eagle Outfitters, Inc. The campaign included images and video featuring a lineup of celebrities including tennis player Coco Gauff, actor and musician Joshua Bassett, and actors Maitreyi Ramakrishnan and Michael Evans Behling, along with multi-hyphenate mxmtoon.

Madelyn Cline became a brand ambassador for Tommy Hilfiger in 2023. Her role includes participation in various campaigns and attending brand events. Before this, she established herself in the fashion industry through contracts with brands like American Eagle, Stella McCartney, and Versace.