Her ex-husband, Álvaro Jacomossi, is also a model.
Parents: Maribel Bergossi and Antônio Carlos Fontana.
At the age of 14 moved from Brazil to Milan to start her modeling career.
Second Son, Lucas Castelli [b. 23 October 2006] in São Paulo, Brazil. Father is husband Henri Castelli.
In 1996, Isabeli was one of the finalists in an Elite Model Look Contest in São Paulo, Brazil.