Taking to Instagram, Hewitt shared an adorable picture of her daughter which was taken four years ago.
"See ya 2017! #throwback #ava #3yrsold," she captioned the snap of her little girl holding onto a dolly mid-stride.
Hewitt last shared an image of her little girl in October last year to commemorate her 7th birthday.
Hewitt also shares daughter Mia, 12, and son, Cruz, 9, with her husband of 12 years Lleyton.