"I knew Tom was the one straightaway," she told Vogue UK for its March issue. "I could see it in his eyes that he was a man with integrity who believes in the same things I do."
Bündchen, 34, who has two children with Brady, 37, -- Benjamin and Vivian -- also revealed how she separates her home life from her modeling career.
"I'm a model as a job, I'm Gisele, the daughter of Valdir and Vania, I'm a woman, I am a model. When I go home and shut the door, that's it. If I want to expose something, it should be my choice," she said.
Bündchen also may be one of the most familiar faces in the world, but she appreciates the simple life.
"My earliest memory was going to my grandma's house, milking the cows and collecting the eggs from the chickens," she added. "If I could choose, I'd be bare feet, with animals all around me and living in a tree house. Like Tarzan and Jane, that's my dream. I'm at my happiest around nature."