In 2013, Miller appeared in Cycle 20 of the CW Network reality television show America's Next Top Model, in which she competed against fifteen other aspiring models. In the competition, Miller was one of the front-runners, having never placed below fifth after the first panel, where she was placed tenth. She was one of the strongest of her cycle, having won a total of five challenges and received six first call-outs. Also, Miller's photograph from the paint photoshoot was deemed by Tyra Banks as one of the best produced in the history of the show. In Week 8, Miller failed to book any shows during LA Style Fashion Week. At the final runway show in Bali, Miller faced difficulty when she accidentally stumbled with her stilettos on her gown. Despite this, the judges were still impressed by her walk. At the final deliberation, the judges noted Miller's command on the runway, her fluidity, as well as her high-fashion and girl-next-door appeal. She would eventually beat fellow competitor Marvin Cortes in the cycle finale, becoming the twentieth winner of America's Next Top Model.
Miller's win also means that she is the sixth winner of America's Next Top Model to have never made an appearance in the bottom two, along with Jaslene Gonzalez, McKey Sullivan, Nicole Fox, Krista White, Sophie Sumner and later winner India Gants. Miller also became the second America's Next Top Model winner to have also never even appeared in the bottom three. This was preceded by cycle 13 winner Nicole Fox. She is also the second winner of the show to have received a total of six first call-outs after Ann Ward, the winner of cycle 15[3]
After winning America's Next Top Model, Miller received a modeling contract with NEXT Model Management in Los Angeles, an eight-page spread in the December/January 2014 issue of Nylon magazine and a $100,000-ad campaign with Guess.
Following her win in America's Next Top Model, Miller was featured in a segment for the November 22, 2013 episode of VH1's Best Week Ever[4] and OK!TV[5] in December 2013. In 2014, Miller appeared on the cover and spread for the February issue of Cleo magazine Malaysia, and an editorial for August Man magazine Malaysia.[6] She has recently fronted the covers of SÝN magazine, Swiss Made Magazine, Blum Magazine and Desnudo Italia, and has editorial spreads in Ellements, Kode, Creem, Remix, 35mm, Flesh, Cake, and Jute magazines. She also appeared in the music video for Fences song “Sunburns”, “Restless Heart” by Finnish singer Niila and “Lemon Drop” by Absofacto.