Kristin Cavallari is bringing her boy into the spotlight. On Tuesday, the mom of three took to Instagram to do something she NEVER does: share a photo of her kid's face! In a Story post, the 38-year-old shared a rare glimpse at her 10-year-old middle child Jaxon's face. In the snap, he's sitting at a table coloring in a poster urging his classmates to vote for him at his school's election. It reads: "Vote Jaxon for Mayor" Related: Lady GaGa Teases Timeline For Starting A Family With Fiancé Michael Polansky! See (below): (c) Kristin Cavallari/Instagram This is pretty major for the . . .