Bringing up babies Harlow, 2, and Sparrow, 7 months, is a strictly green affair for Nicole Richie and fiancé Joel Madden. "Nicole is obsessed with doing everything she can to try to keep her children healthy and safe," a friend of the star tells Life & Style. Constantly combing books and Web sites for the latest parenting news, Nicole "insists on everything being organic," the friend says. "The food, the diapers, the clothing. She's always at Whole Foods." It's a far cry from how Nicole herself was raised. "Her parents let her do whatever she wanted," says an insider. "Now she has strict rules."

RULE 1: USE CHLORINE-FREE DIAPERS
"I use Seventh Generation," Nicole says about the diapers that claim to be not only free of chlorine but also nontoxic and hypoallergenic. "And we don't use baby wipes -- we use cloth with water."

RULE 2: NO CELL PHONES
"She thinks the radiation can be damaging and won't let cell phones near her kids," a pal tells Life & Style.

RULE 3: EAT ORGANIC
Nicole even grows her own veggies in her garden, from which she prepares salads and stir-fries for vegetarian Joel.

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Photo Credit: Startraks