Greg Risling, spokesman for the District Attorney's office, said that case was brought forward by the city of Santa Monica, Reuters reported.
The L.A. County sex crimes task force hasn't given any specific details about the case. Police say the woman reported the alleged incident to police in Santa Monica in November previous year.
Singer in December told United States media when the allegation first surfaced that his client "categorically disputes the claim and it is apparent that the woman filed the report to get a media outlet to publish the story".
The woman filed a police report in December, even though it was past California's 10-year statute of limitation on sexual assault.
The case was presented by the Santa Monica Police Department, according to KABC.
A legal representative for Stallone denied the allegations for a second time on Wednesday.
Last year, a 16-year-old girl accused Stallone and his bodyguard of sexually assaulting her in a Las Vegas hotel room in the 1980s, which he also denies. Notwithstanding that, she filed a police report, (and) the media outlet refused to publish the story.
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Prosecutors in Los Angeles are reviewing an allegation of sexual assault which has been made against Sylvester Stallone.
In other cases against Hollywood figures, the DA in Los Angeles has thus far declined to file criminal charges.
Sylvester Stallone accepts the Best Supporting Actor award for "Creed" at Critics' Choice Awards on January 17, 2016 in Santa Monica.
Stallone skyrocketed to fame in 1976 with his Oscar-winning boxing movie Rocky and went on to become one of Hollywood's biggest action stars through the Rambo and Rocky film franchises.
Strangely though, a photograph of Stallone standing next to Trump in the Oval Office makes it into a four-minute video the Trump Administration recently made to persuade Kim Jong Un to rejoin the world community.
Stallone's lawyer, Marty Singer, said at the time that the actor "categorically disputes the claim".