'I have the honour of knowing the beautiful Delta Goodrem,' Erin revealed before taking to the stage.
'We met doing the musical Cats, I was her standby. I used to come in on the hour and hang out in the dressing room while she got ready.'
'Delta is hilarious, Delta is beautiful, Delta is inspiring, ah, Delta,' she gushed.
While Erin impressed both Kelly Rowland and Delta, fans couldn’t help commenting on the contestant’s seeming obsession with her former co-worker.