According to the reports, the woman sought refuge in a kebab shop on Boulevard de Clichy in the about 5am on Saturday (1pm AEST) and workers there called police when they saw the state she was in.
The intoxicated woman reportedly told police she had been sexually assaulted by five men but could not give more details.
Her dress was inside out or the wrong way around and partially ripped, according to some reports.
The 25-year-old was taken to the nearby Bichat-Claude Bernard Hospital.
Police from Alliance Paris say “several investigation techniques will be used along with technical and scientific police”.
Some reports indicated the woman was set to return to Australia at the weekend or early this week but it was unclear if she had done so.
The second district of the judicial police, which has carriage of the “gang rape” investigation, was yet to comment publicly.
The 18th arrondissement includes the touristy Montmartre, party hotspot of Pigalle and many lesser-known areas some consider to be less safe.
9News.com.au has contacted the Department of Foreign Affairs and Trade for comment.
