Nicole Richie Says She's Pregnant

Yes, it's true: Nicole Richie is four months pregnant with Joel Madden's child.

With the tattooed Good Charlotte lead singer by her side, Richie talked to Diane Sawyer on "Good Morning America" about her pregnancy, her drug use, her weight and upcoming jail time.

The interview will air on "Good Morning America" Thursday and Friday, and on "20/20" Friday night.

The 25-year-old reality star also talked about her friendship with Paris Hilton as well as the troubled lives of Lindsay Lohan and Britney Spears.

After pleading guilty last Friday to charges of driving under the influence on Dec. 12, Richie was sentenced to four days in jail.

Photos: Baby Bumps
"I have a responsibility and it's something that I did wrong, and if I could personally apologize to every single person that has lost a loved one from drunk driving, I would," Richie said about her recent guilty plea. "And unfortunately, I can't, but this is my way of paying my dues and taking responsibility and being an adult."