She was the eldest of two children who were born to David Stasey and Sally, who migrated originally from Norwich in England. Her mother used to work as a primary school teacher at Sandringham Primary School in Melbourne and her father was a stock broker, who also worked as interior designer. The family who were mostly together was disintegrated when Caitlin went to England at the age of 7, and lived for almost a year with her grandparents. There, she got chance to meet some old family and relatives and also travelled around. After returning back to Australia, she had been a different and more confident girl. Born and raised in Australia, she is an Aussie by nationality and belongs to white ethnicity. Both of her parents followed protestant but she says that she doesn’t have a particular religious background.