May 23, 2011 04:00 PM

Jemal Countess/Getty

Nature or nurture? Rebecca Romijn seems to vote nature when it comes to fraternal twin daughters Charlie Tamara Tulip and Dolly Rebecca Rose.

“It’s just like a crazy social experiment where you have these two people who were born on the same day, who have been raised in identical upbringings in the same bedroom and they could not be more different as people,” the actress says during Wednesday’s Rachael Ray Show.

“People are just born how they are born and there’s nothing you can do to change that.”

Case in point? When Romijn, 38, and husband Jerry O’Connell sat their 2-year-old girls down to watch the royal wedding last month, the twins’ response to the glitz and glamour proved to be exactly what their parents expected.

“Their reactions to it could not have been more polar opposite. Charlie is going, ‘Princess, princess, princess,’ with starry eyes and Dolly was running out of the room going, ‘No, no, no!'” Romijn laughs. “Charlie, since she was a baby, if I get dressed up for something, she’s the one who looks me up head to toe, checks out my shoes, takes it all in. Dolly’s never noticed.”

While her sister places her focus on fashion and all things girlie, Romijn reveals that Dolly has become the family’s little daredevil. “[She’s like,] ‘Where is a giant piece of furniture I can stand on top of and almost die?'” says Romijn.

“I feel like we’re getting through the death watch period where they might almost die, but hopefully we’re going to start communicating and explain why you can’t stand on that really tall piece of furniture.”

As for the family disciplinarian, Romijn admits she wears the hat well as O’Connell — who she lovingly calls a “softie” — is idolized by the girls. “They’re in this little girl like ‘Daddy is a rockstar’ [phase]. He walks into the room [and] they’re like, ‘Daddy! Daddy, daddy, daddy!” she says.

Yet it is O’Connell — and not Romijn — who has faced the fears of taking Charlie and Dolly out on the town alone. While the doting dad has no qualms about venturing out with his daughters, Romijn admits her on-the-go girls can run — very fast.

“They’re at this age where they run off in opposite directions from one another, so I’m still not really brave enough to take them out alone by myself because you can’t run in two directions,” she explains. “So if you’re in the middle of the parking lot and they both just drop dead weight … Jerry’s big enough, he’s brave enough, to scoop down and pick them both up, but they’re getting to be big people!”

— Anya Leon

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