The image was presumably taken when Ada got cast as Katerina on Heartbreak High, a series about a Sydney inner-city school.
Fans were quick to flock to the photo, commenting how much they loved the flashback.
'I used to watch this! Loved you then and now 💓,' one wrote.
Another added, 'OMG! Loved heartbreak high! What a blast from the past!!'
A third echoed, 'Heart break high!! Fav tv series ever!!'
Do you remember Heartbreak High? Head to our Facebook page to let us know!