Mercado, who suffers from muscular dystrophy, will make her scripted debut on the Showtime series. She has appeared on E! News and has modeled in campaigns for Beyoncé, Olay, Bumble 100, Calvin Klein fragrance, Nordstrom, Target and Tommy Hilfiger. On Sunday night, Mercado apparently teased her casting news: "Tomorrow is such a special day and I am so excited to share with you ALL something that I have been part of for the last couple of months. So put your seatbelt on! And if you have one already tighten it."