TMZ reported that Ortiz and his brother were in Pasadena's Rose Bowl stadium attending country musician Kenny Chesney's concert when they got involved in a verbal argument with another man.
The argument escalated and became physical, and reports claimed that Ortiz kicked the victim while he was on the ground.
Ortiz, who also recently had an acting role in 'The Expendables 3', was arrested along with his brother on charges of felony assault with a deadly weapon – the weapon being his foot in this case.
He was later released on $30,000 bail.
Ortiz, who lost his WBC title to Floyd Mayweather in 2011, has not yet commented on the incident.