When Bec posted a photo of herself and Mia to her Instagram account, her followers were quick to comment on how similar the pair look.
"Wow, you look like sisters 😍 gorgeous," said one follower.
"Gorgeous ladies. You could pass as twins," another fan said.
While Delta Goodrem also commented on the post: "OMG so beautiful, and so grown up ♥️♥️💜💜"
Proud mum Bec shares daughter Mia with her husband Lleyton.
The couple, who married in 2005, also share 10-year-old Cruz and 8-year-old Ava.