After months of rumors, Nicole Richie confirmed Tuesday that she is pregnant. “Yes I am. We are,” Richie told ABC News’ Diane Sawyer for an interview to be aired this week. “I’m almost four months.” Richie’s boyfriend, Good Charlotte frontman Joel Madden, is the father, she told ABC, which issued a news release about the interview.

The 25-year-old star of “The Simple Life” and on-again pal of Paris Hilton also talked with Sawyer about her guilty plea last week to driving ...