The 30-year-old rapper previously filed a lawsuit against the blogger Milagro Gramz after it was alleged that she was "a paid surrogate" for Lanez.
A federal panel of five men and four women in Florida agreed that the blogger defamed and harassed the rapper, who has been awarded $US59,000 in damages, according to NBC News.
Stallion appeared in court in November to testify in the defamation trial, when she claimed that Gramz' comments affected her mental health, as well as her music career.
The chart-topping star revealed that she actually felt like life was not worth living at one point in time.
Stallion launched her lawsuit back in October 2024, when she accused Gramz of "churning out falsehoods" about her shooting by Lanez in 2020.
In a statement, Stallion said: "It's time to hold bloggers accountable for years of harassment, cyber-bullying and the publication of misinformation about my personal and professional life.
"I've endured countless attacks on my character based on false narratives from social media bloggers misrepresenting themselves as journalists.
"It's unacceptable behaviour and these individuals need to understand there will be repercussions for recklessly posting lies and defamatory falsehoods."
In August 2023, Lanez was sentenced to 10 years in prison after being convicted of shooting Stallion.
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