I saw pictures of the victim when this story first broke and in my opinion she most certainly looked 15 at the time if not younger.
To be honest the fact of whether she looked older than 16 or not is irrelevant anyway because Adam Johnson knew she was (barely) 15 when he first messaged her, we have seen the proof in the texts and his admission to grooming.
I cannot fathom why his girlfriend continues to support him, even if he had denied it all to her at the beginning, surely his pleading guilty to the grooming and one other charge would be enough to make any self respecting woman leave quickly, even before all the texts etc have been made public.
I would bet on it that his defense will use her pregnancy and the birth of their baby as some sick justification for his "totally out of character moments of weakness"
His girlfriend is a very pretty girl and he looks like a cross between Sheldon Cooper and George Osbourne - even without the now added nonce factor.