Prince Jacques is an identical look-alike of Princess Charlene at the very same age, even the same expression (only difference is her hair was a bit darker is all):
http://i.dailymail.co.uk/i/pix/2015/01/17/24C8F35C00000578-2913172-image-a-30_1421508889084.jpg
http://i.dailymail.co.uk/i/pix/2015/01/17/24C8F35C00000578-2913172-image-a-30_1421508889084.jpg