The couple met while filming the 10-part drama, in which former Home and Away star Lincoln portrayed colourful nightclub owner John Ibrahim.
They were first spotted together in April this year after a lunch date in Sydney.
The pair recently stepped out officially together at an event for GQ Australia.
Courtney, 25, is an up-and-coming actress best known for her role in Aussie TV drama Paper Dolls.
Your secret’s out now, guys!