Gemma shared the old snap with fans last night (25 March) and it was taken in the early days of TOWIE when she had recently joined the show.
In the blurry photo, Gemma - who is now a blonde bombshell - has brunette hair and is posing alongside former co-stars Lauren Goodger and Lydia Bright.
Posting the picture on Twitter, she said: "Can't believe how young I look when I first started TOWIE god it's mad when you look back x."
Gemma's fans were quick to respond, with one saying: "Omg gem you had brown hair!! Xx."
The reality star, 33, joined TOWIE in the second series back in 2011 when she worked as a car saleswoman.
Gemma's first ever scene was of her selling a swish car to Kirk Norcross.
Do you prefer Gemma as a brunette or blonde? Tell us below, as the best comment from across the website each week wins £50!