08/14/2009 AT 05:35 PM EDT
As Kourtney Kardashian prepares for the Christmastime arrival of her first child
with boyfriend Scott Disick, the Keeping Up With Kardashians
star is rejoicing in her new physique.
"My boobs got huge right away," the eldest Kardashian sister, 30, tells PEOPLE, of the first physical change to her body she noticed. "They got so sore, that if anyone even brushed up near me, I would scream."
But Kardashian, who lives with Disick, an entrepreneur, in Los Angeles, isn't concerned about gaining weight. "I'm really embracing it," says reality TV star, who says she's gained 10 pounds so far. "I feel like it's such a beautiful thing, that every woman who goes though it, should embrace it. I think if you're naturally skinny, and pregnant, and that's how your body is, that's fine."
As much as she enjoys her new curves, Kardashian will be watching her diet. "I don't also want to sit there and eat cheeseburgers all night," she says. "I want to do what's healthy for my baby."