At nine-years-old, Petri began practicing ballet and is employed as a model and choreographer.
In October 2004 she won a 'Sims Award' as the model with the nicest personality. She won the contest 'The Heavenly 100' organized by the Flanders' magazine 'Ché' in 2004. She was voted the most beautiful woman on Earth. Second was Beyoncé. She won the 'Top Fashion Designer Award' at the Miss World 2004 pageant. She reached third place in the "World's Top Model" (won by Miss Mexico).