Alves' modeling career began after her parents signed her up for a local beauty contest, which she won[6] and went on to become a finalist in the 1996 Elite Model Look contest. After taking a break to continue her education for a year, she moved to São Paulo and then Paris where she began her international modeling career as a fit model for Yves Saint Laurent.[7] In the late 1990s she made a small number of runway appearances for clients such as Jean-Louis Scherrer and Gianfranco Ferré.
In 2001 she moved to New York and received her first three international vogue covers. Alves quickly rose to top model status following her appearance on the cover of Vogue Italia in April 2002, which was photographed by Steven Meisel. In fashion circles she inherited the nickname "The Body", previously attributed to models Elle Macpherson and Gisele Bündchen, thanks to her physique.[8]
She was featured in the 2003[4][9] and 2005[10] editions of the Sports Illustrated Swimsuit Issue, appeared in two editions of the Victoria's Secret Fashion Show, and was also featured in their catalogs and their book celebrating the company's 10th anniversary, entitled Sexy. She was invited to the Met Gala in 2009, 2011 and 2018.
Alves was featured on the covers of more than 100 major fashion magazines, including international editions of Vogue, Elle, Marie Claire, French, Esquire, L'Officiel, Harper's Bazaar, Amica and Glamour.