Working mom Marcia Cross has turned from Desperate Housewife to Desperate Mother now that she has to leave her twins at home – some days.

"I had them come with me last week," Cross tells PEOPLE of her on-set demands for daughters Savannah and Eden. "I think if I have one full day, then the next day they have to come with me [to work] because I can't not see them for that long."

"When they're with me [at work], that's challenging, but when they're not with me ... I'm a new mother, that's what it is, it's all challenging," Cross explains.

An unexpected side effect of having her girls on Wisteria Lane is the attention they attract from cast and crew. "I'm trying to keep them slightly sequestered because everybody's [squealing with delight]," says Cross. "They want to scream."

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