Amber Heard, her lawyers and Johnny Depp's lawyers were present in the courtroom when the verdict was read out.
Johnny Depp himself could not attend as he is in the UK due to work.
The six-week trial, which ended last week, has been followed by millions of people around the world.
Spicy details from the ex - couple's life have been discussed in public, and on social media, people have taken a stand on the infected dispute.
Johnny Depp accused Heard of libel, after she wrote in an article in the Washington Post that she had been beaten in a previous relationship, without naming the alleged perpetrator.
Depp demanded $ 50 million from her.
Heard responded with a lawsuit, demanding twice as much money from Depp for the "extensive physical violence and abuse" she claims Johnny Depp subjected her to.
Initiated a relationship in 2012
The defamation lawsuit was largely about what happened, or has not happened, in the couple's relationship that began in 2012. They married in 2015, but the following year Heard filed for divorce and accused Depp of abusing her - something he always firmly denied.
During the trial, accusations of violence and abuse have hailed between the parties.
Both claim to have lost film roles and large revenues due to what happened between them.