Graduating from high school at age 16, Morgan began mainstream modeling when she was 17. During that time she met Joe Francis of Girls Gone Wild video fame at a nightclub, who in turn introduced her to Steven Hirsch, head of Vivid Entertainment. Hirsch signed her to Vivid, and Morgan soon after started working for Francis as a hostess for the Girls Gone Wild videos. Morgan did attend college for a time, but dropped out.

Morgan's first video for Vivid was the 2005 film Sunny starring Sunny Leone, where she performed with Manuel Ferrara; in fact her scene was already planned and coordinated before she signed her contract with Vivid. By May 2006 she had filmed six features and five additional movies. Morgan sought out the adult industry stating in a Hustler interview that she made more money in mainstream modeling. That she switched industries because she wanted to change Americans perceptions of sex. In 2007, Morgan was nominated as the AVN Best New Starlet Award. She has also attracted attention in gossip columns for her alleged relationships with Rick Salomon, Jesse Metcalfe, Wilmer Valderrama and former Mötley Crüe drummer Tommy Lee.

On May 30th it was confirmed that Stefani would be writing weekly columns on insideSTL.com for a young entertainment website.