Jamie Oliver has shared a throwback photo of himself on Instagram, and his fans cannot get over how much he looks like his youngest son River in the snap.Looking bright-eyed in a blue hoody and jeans, Jamie, now 45, certainly looked like little River in the picture, especially with all of that blonde curly hair! MORE: Jamie Oliver poses with son 'grown-up' Buddy as he reveals his special attitude to lifeMORE: Jamie Oliver's son Buddy's homeschooling photo is unlike any you've seen before"The