Nicole Richie has reportedly pledged to go through childbirth without any painkillers as to not compromise her current drug-free lifestyle.

Nicole, a former heroin addict who admitted taking Vicodin and smoking marijuana before her arrest in December, insists she has been drug-free since finding out she was pregnant in May because she wants to be someone her child can look up to.

A source close to Nicole told Star: “[She] has been adamant about not putting any sort of drug or chemical into her body since she learned she was pregnant. Nicole has made her mistakes in the past, but she doesn’t want her child to suffer because of them.”

“She’s has become incredibly strict about what she puts in her body. She wouldn’t dream of taking anything that might be bad for the baby.”

“[She] realizes that she has an extremely addictive personality. She knows that if she allows herself to take even one pain pill, it might be a slippery slope for her.”

“She’s hoping to go through childbirth without an epidural or any other painkillers. She feels if she can get through that without drugs, she can get through anything.”

But the socialite still allows herself diet cola to drink: “Diet drinks aren’t recommended for pregnant women but Nicole indulges herself, figuring it’s the least of all evils!”

The baby, Nicole’s first child with boyfriend Joel Madden, is due in December.