Reese Witherspoon has admitted she panicked and said "crazy things" the night she was arrested.
Speaking in a TV interview on ABC's Good Morning America, the actress repeatedly apologised for her behaviour during the April 19 traffic stop in Atlanta.
According to a police report she asked a Georgia State Trooper: "Do you know my name?" She added: "You're about to find out who I am."
The Oscar-winning actress said she had "one too many" glasses of wine and panicked.
It is the first TV interview since her and her husband were pulled over.
"I have no idea what I was saying that night," she said. "I literally panicked. I said all kinds of crazy things. I told them I was pregnant. I'm not pregnant."
The 37-year-old was arrested after the trooper said she would not stay in the car while her husband, Hollywood agent Jim Toth, was being given a sobriety test.
TMZ posted a dash-cam video of the arrest, which shows a state trooper repeatedly telling Witherspoon to get back inside the car while he speaks to Toth.
The actress told him she was pregnant and needed to use the toilet.
At another point in the video, she defies the trooper's warnings to stay in the car, and is handcuffed.
"This is harassment! You're harassing me as an American citizen! I have done nothing against the law!" she says.
Toth was charged with drunken driving and is due in court on May 23. Witherspoon faces a May 22 court hearing on a disorderly conduct charge.
"There are so many lessons learned," she said.
"When a police officer tells you to stay in the car, you stay in the car," she said.
"I learned that for sure. I learned a lot."