But it appears Southern's voice on this occasion is not wanted by CPAC.
The Institute of Public Affairs,which sponsors the event,is believed to have been among those who raised concerns about Southern's inclusion.
A number of federal MPs scheduled to appear on the line-up and other interest groups had also flagged discomfort standing up at an event alongside Southern.
"A lot of people that support CPAC and want the event to succeed thought it was inappropriate for her to be there,"one source close to the event told CBD.
Southern,who is married to an Australian and has moved to Sydney,remains a contentious figure even in conservative circles after being snapped in a widely circulated photo making a"white power"hand gesture to white supremacists,including members of the neo-Nazi group Antipodean Resistance.
Others regard Southern's views on the"Great Replacement"– a conspiracy theory that warns of white genocide – to be abhorrent.
And quite rightly,mind.