"Oh haaii … Gina Riley is now rocking the grey/silver hair better than Trude," one fan commented on the photo after it was shared to a Kath & Kim fan page.
Riley surfaced on her daughter's Instagram back in 2018 as well, posing alongside her husband and a statue.
Kath & Kim ran on the ABC and Channel 7 from 2002 to 2007, starring Jane Turner, Glenn Robbins, Magda Szubanski and Peter Rowsthorn.
The sitcom went on to make two spin-off movies, Da Kath & Kim Code (2005) and Kath and Kimderella (2012).
In 2018, Szubanski and Turner discussed the possibility of bringing the show back for a reboot. They admitted that it would definitely need a modern spin if it were to fit into current trends.
"Never say never," Szubanski told TV Week at the time.
Turner, who co-created the series with Riley, added, "It would be very different now. There are always funny new trends and things Kath and Kim could put their spin on, which would be fun to do."