ABC News' Steve Osunsami and Katie Kindelan report:

The public now has a first-hand glimpse of what really happened during Oscar-winning actress Reese Witherspoon's recent disorderly conduct arrest, thanks to a leaked dash-cam video.

In the video, posted online by the website TMZ, Witherspoon, 37, is shown interrupting the Georgia state trooper who pulled over the actress's husband, Jim Toth, for allegedly failing to stay in one lane while the couple drove home from dinner April 19 in Atlanta.

Click HERE to watch Reese Witherspoon discuss her arrest live on "GMA."

"I'm a U.S. citizen … I'm allowed to stand on American ground and ask any question I want to ask," Witherspoon said as the officer, Trooper First Class J. Pyland, tries to administer a sobriety test to Toth, 42.

"This is beyond. This is beyond," she says in the video. "This is harassment. I'm now being arrested and handcuffed? … I'm obstructing your justice?"

Hours before the video was leaked, Witherspoon appeared on " Good Morning America" and told anchor George Stephanopoulos she was "acting crazy" and "so disrespectful" to the arresting officer.

"I saw him arresting my husband and I literally panicked," Witherspoon said on "GMA." "I told him I was pregnant. I'm not pregnant. I said all kinds of crazy things."

Witherspoon's outburst resulted in her arrest on a disorderly conduct charge, while her husband, CAA agent Toth, was arrested and charged with driving under the influence and failure to maintain the lane.

MORE: Reese Witherspoon 'Deeply Embarrassed' After Arrest

Witherspoon pleaded no contest Thursday to the disorderly conduct charge and was fined $213, according to court documents. Toth pleaded guilty to the DUI. He will not face jail time but must complete an alcohol-education program and community service.

Witherspoon chalked the incident up to "one of those nights" in her live interview on "GMA," the first since her arrest.

"We went out to dinner in Atlanta and we had one too many glasses of wine," she said. "We thought we were fine to drive and we absolutely were not. We know better and we shouldn't have done that."

Toth can be heard in the video trying to quiet his wife of two years, whispering "Reese, Reese," and then saying, "I'm sorry. I had nothing to do with that," to the police officer.

Witherspoon made headlines when her arrest was first made public for using her celebrity to try to threaten the officer.

"Do you know my name sir?" she said. "You're about to find out who I am."

VIDEO: Watch Reese Witherspoon Get Handcuffed

On "GMA," the "Walk the Line" actress, who also famously starred as Harvard-educated attorney Elle Woods in the hit "Legally Blonde" films, attributed her acting roles to her behavior that night.

"I played a lawyer in a movie so many times I think I am a lawyer," Witherspoon said. "And, clearly, I'm not a lawyer because I got arrested."

The couple, who were both taken to jail briefly before being released, married in March 2011 after a year of dating. They have a son, Tennessee James Toth. Witherspoon also has two other children - daughter, Ava, 13, and son Deacon, 9 - from her previous marriage to actor Ryan Philippe.

RELATED: Reese Witherspoon: Baby 'Stole My Brain'

"We have to say when you make a mistake, you take responsibility and we are taking responsibility and doing everything in our power to make it right," she said of how she explained her arrest to her children, adding it had been the "hardest part" of the ordeal.

With a grin on her face, Witherspoon told Stephanopoulos the lesson she herself had learned.

"When a police officer tells you to stay in the car, you stay in the car," she said. "I learned that for sure."

The actress, now starring in the movie "Mud," had been in Atlanta to work on the film "The Good Lie."