Rebecca Romijn doesn't want more children.

The 36-year-old actress – who has eight-month-old twins Dolly and Charlie with husband Jerry O'Connell – is happy with her family and has no plans to add to her brood.

She said: "I'm pretty sure that this is it. We feel like the world was made for pairs. Four feels like the perfect number."

"Also, we're not interested in overpopulating this world. So we feel like we don't want to leave more than we are when we leave this planet."

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Rebecca is currently shooting new series "Eastwick" – based on John Updike novel "The Witches of Eastwick" – but admits she finds it hard to be away from her children.

She explained to E!: "Mother's guilt is no joke. 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!"

Jerry – who recently enrolled at law school – looks after the babies which Rebecca is working, and often brings them to set to see her.