At 13, Ren became a model for the label Brandy Melville.[3] She became a social media personality at 15 when photos of her in a black string bikini posing by a pool went viral on Tumblr.[5] She has since appeared in advertisements for the mobile game Final Fantasy XV: A New Empire.[6][7] She launched an activewear line called Ren Active.[8] In September 2018, it was announced that Ren would compete on season 27 of Dancing with the Stars. Her professional partner was Alan Bersten.[9] Ren and Bersten reached the finals and came in fourth place on November 19, 2018.[10]