Cindy Crawford showcased just how much of the modeling gene runs through her family as she posted a heartwarming tribute to her son, Presley Gerber.RELATED: Cindy Crawford is identical to her teenage daughter Kaia in incredible throwbackThe supermodel shared a throwback picture of the two of them together from when he was just a child in honor of his 22nd birthday.WATCH: Cindy Crawford talks about the death of her brotherThe two look absolutely beautiful in the black and white shot, illuminated