[2][3][4] Known for her doll-like face, Trentini rose to fame after capturing Marc Jacob's attention and being cast on the ad campaign.

In 2000, when Trentini was 15, she was discovered walking down a street in her hometown by an agent, the same one who scouted Gisele Bündchen,[8] and soon afterward she moved to São Paulo, a common destination for young Brazilian models.

Soon she was booked for brands such as Versace, Vera Wang, Victoria's Secret, Chanel, Baby Phat, Oscar de la Renta, Ralph Lauren, Calvin Klein, Dior and Dolce & Gabbana.

In 2007, she was the face of Gucci Cruise, Oscar de la Renta, Dolce & Gabbana Animelier, DSquared² and Mulberry.

"[12][13] In 2008 casting agent James Scully, who is responsible to pick which model is to score a spot on top runways, says in regards to Trentini:Perfect body.

Immediately after breaking up with Demarchelier, in early 2010, she got back together with Brazilian photographer Fabio Bartelt, who was her first boyfriend.