"All the Spice Girls will be touring Australia," Henderson said on the 2DayFM breakfast show Kyle & Jackie O. "No official announcement has been made, but I have a source, a very reliable source."
Her co-host then hinted that the source might be Melanie Brown--more commonly known as Mel B or Scary Spice--a good friend of Henderson's.
This latest rumor comes contrary to persistent suggestions that the members of the group were more focused on newer ventures, including Brown's television appearances and Victoria Beckham's fashion line.
All five Spice Girls reunited in 2012 to perform at the closing ceremony of the Olympic Games, their first since 2008.