Madelaine got her acting start in 2014, when she would guest star in several different shows as well as the small movie, "The Curse of Sleeping Beauty." However, her big break happened a few years later in 2017, the year she was in the dramedy, "F*** the Prom." And as for TV, almost everyone knows her now from her iconic, sassy role of Cheryl Blossom in the hit series, "Riverdale" (via IMDb). Fans fell in love with her portrayal of the comic character, and soon her character became a bisexual icon (via MSN). As of 2021, she's currently working on two more productions to come out in the next couple of years, plus a few more seasons of "Riverdale" on the way. Of course, success didn't arrive without hard work; Petsch recalls going on almost 250 auditions before getting her big break (via The Famous People).

As for her personal life, she was in a three year relationship with rapper, T. Mills (via Vogue). They frequently shared their relationship on social media. However, in 2020, millions of fans heart broke when news came that the couple split.