The two have already decided that their 8-month-old twins, Dolly and Charlie, are enough kids for them.
"I'm pretty sure that this is it," Romijn told me yesterday. "We feel like the world was made for pairs. Four feels like the perfect number."
"Also, we're not interested in overpopulating this world," she added. "So we feel like we don't want to leave more than we are when we leave this planet."
Romijn is hard at work on Eastwick, her new ABC drama-fantasy series based on the John Updike novel The Witches of Eastwick. Romijn, Lindsay Price and Jaime Ray Newman star as three small-town women with witchy powers.
Romijn didn't actually plan on working after giving birth. "I had put it out there that I just wanted to be a mom for six months and not even think about work at all. I told the powers that be if anything came across their desks that I'd be devastated if I missed out on it, to make sure that I knew about it. And [Eastwick] is the only thing I read."
She was still nursing when they shot the pilot. O'Connell now brings the little ones to set to visit mom at work.
"Mother's guilt is no joke," Romijn admits. "I feel like any stretch of time I spend away from them, I'm worried that I'm missing out on just these little miracles. Like you watch them stare at their hand for an hour and they go take a three-hour nap and they wake up and they can do something that they didn't do before—like wave!"
Baby worries aside, Romijn says she couldn't be happier about her decision to sign on to Eastwick. "Getting to work with Jaime and Lindsay is just the best," she gushes. "I defy anyone to come up with any diva bitch stories from our set. It'll never happen."
Check out celebs in their first breakout roles by heading over to our TV Stars: Then & Now gallery.