And, despite the pressures and her youth, the Canadian beauty seems to have a surprisingly mature perspective on things.
"With modeling, you are judged on your looks," she says. But you have to realise that it's only your appearance that's being judged, not you as a whole.
Jessica's profile received a further boost that December when she joined Victoria's Secret as one of the luxury lingerie label's angels, taking to the catwalk alongside Gisele Bundchen and Karolina Kurkova.
These days the model's schedule is so busy there's little time for dating, but in the past Jessica has been romantically linked to singer Anthony Kiedis, lead vocalist with the Red Hot Chili Peppers, and Harrison Ford's son Malcolm.
"The only place I had to myself was a top bunk and my suitcase." Jessica made her entry into the world on April 23, 1986, joining a large, devout Christian family on a farm in Kincardine, Ontario.