The Instagram post was uploaded as a part of the 'throwback Thursday' online hashtag trend.
The caption of the image read: "Throwback to the photoshoot wearing my baby best! Styled by my very first stylist @kapoor.sunita #ThrowbackThursday."
The 34-year-old's Insta post received more than 120,000 likes in about an hour.
The comment section was filled with followers who smothered young Sonam with overwhelming affection.
One user went all ga-ga and commented: "Cutie patoootie!!!".
"Omg soooo cuuuute! Already a model since then!!!" wrote another.