According to the report, the alleged victim snuck a cell phone past his security team into a party. When she tried to take a picture of Brown, she claims he lost his temper and hit her in the right eye.
The woman, who identified herself to TMZ as Liziane Gutierrez, left the party and reported the incident to police a few hours later. She did not go to the hospital for her injuries, but law enforcement is investigating the incident.
Representatives for Brown have told the gossip site that the story is "undeniably untrue." This is the second time this year that Brown has been suspected of violent behavior in Sin City. The singer was a suspect of misdemeanor battery in May, just six weeks after completing his probation stemming from his 2009 attack on Rihanna.