Has a son named Zion, born on March 28th 2003, from her first marriage to Álvaro Jacomossi. Zion was born in New York.
She has two brothers: Harrison and Heric.
Parents: Maribel Bergossi and Antônio Carlos Fontana.
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.