Nicole Ritchie

The rumors are true: Nicole Ritchie is pregnant.

Speaking to ABC News interviewer Dianne Sawyer, the 25-year-old co-star of TV's The Simple Life said she is almost four months along in her pregnancy.

She said the father is her boyfriend, Joel Madden of the rock band Good Charlotte. Ritchie also spoke about her guilty plea last week to driving under the influence and the resulting four-day jail sentence.

"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," she said. "And unfortunately I can't, but this is my way of paying my dues and taking responsibility and being an adult."

The interview airs August 2 and 3 on Good Morning America, and later August 3 on 20/20.