Nicole Richie5

It’s hard to believe that Nicole Richie is the same girl who once struggled with a DUI arrest and an addiction to heroin.

These days, pals say Nic has completely turned her life around. Most recently, the expectant mama of two – who is expecting her second child this August – has “gone green,” adopting the environmental-friendly lifestyle that has become all the rage with health and nature-conscious fanatics around the Globe.

Nicole, 28, is insisting that her one-year-old daughter Harlow and BF Joel Madden consume only organic fruits and veggies. She’s even growing an organic vegetable garden in the expansive backyard of her Hollywood Hills home. Nicole also does all of the cooking for her family – which involves making lots of salads and veggie stir fry.

A expert on All Things Nicole tells the May 25 issue of The National Enquirer: “Now that she has another child on the way, Nicole is thinking more and more about the Earth and living a sustainable and clean lifestyle.”