Nicole Richie Tells Diane Sawyer She's Four Months Pregnant

Almost four weeks after Us Weekly first broke the news that Nicole Richie and boyfriend Joel Madden were expecting, Richie has finally confirmed her pregnancy.

In an interview scheduled to air this Thursday on Good Morning America and then Friday on Good Morning America and 20/20, the former Simple Life star tells ABC News' Diane Sawyer, "Yes I am. We are. I'm almost four months."

In addition to finally coming clean on her growing baby bump, Richie, 25, talks to Sawyer about her decision to plead guilty to drunk driving charges. “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. And unfortunately I can’t, but this is my way of paying my dues and taking responsibility and being an adult.”

Richie was convicted on July 27 and must serve 96 hours in jail for her DUI within the next 60 days.

Nicole Richie Engaged & Almost Wed in Vegas

'The Simple Life' star and the Good Charlotte frontman almost tied the knot in Las Vegas' on February 17, but decided to get Nicole's adoptive dad Lionel Richie's blessing first.

A source told National Enquirer magazine: "They picked out matching silver and diamond rings at a jewellery boutique in Caesar's Palace and then headed to the Little White Wedding Chapel where the hovered outside for ages.

"But Nicole Richie wanted her dad's blessing so they went straight to see him when they got back to Los Angeles."

Joel was reportedly terrified about asking Lionel for his blessing.

The source added: "Joel was nervous but he was greeted with open arms and a big hug from Lionel, who thanked him for everything he has done for Nicole."

The couple are now planning to marry in front of their close family and friends at Mexico's Las Ventanas resort in Cabo San Lucas.

The source revealed: "It would be a small ceremony with under 100 people."