Amber Portwood is in Boston, visisting with her fiance's family. Amber Portwood has joined Instagram and shared her first photo. Amber Portwood Defends Her Engagement To 43-Year-Old Matthew Baier On Thursday, the Teen Mom OG star officially announced she was on Instagram, and within moments, shared her first selfie, which featured a look at her fiance, Matthew Baier, whom she's currently with in Boston.