Gisele Bundchen

Gisele Bundchen, who tied the knot with Tom Brady last month, says she considers his 19-month-old son with ex Bridget Moynahan "100 percent" hers.

"I understand that [John] has a mom, and I respect that, but to me it's not like because somebody else delivered him, that's not my child. I feel it is, 100 percent," the supermodel tells Vanity Fair. "I want him to have a great relationship with his mom, because that's important, but I love him the same way as if he were mine. I already feel like he's my son, from the first day."

Bundchen, who has never met Moynahan, admits that learning of Moynahan's pregnancy barely three months into her relationship with the New England Patriots quarterback was "not the ideal thing."

"It was definitely a surprise for both of us," she says. "In the beginning you're living this romantic fantasy; you're thinking, This can't be true, it's so good! And then, whoops — wake-up call!"

The unexpected news placed doubts in Bundchen's head.

"You question at times — 'Should I stay here? Maybe you should work this out,'" she says. "But when people break up, it's for a reason."

Ultimately, the pregnancy was a "blessing" and only strengthened her and Brady's bond. "Our relationship has become so much stronger, and I think I wouldn't be as certain as I am today if it weren't for that," Bundchen says.