Hilary Duff's neighbor told cops her boyfriend attacked him. By Emily Smith Hilary Duff and Matthew Koma take baby Banks out for a walk. Congratulations are in order for Hilary Duff and Matthew Kona. As she announced on Instagram on June 8, Duff is pregnant with the couple's. Hilary Duff has given birth to her second child, a baby girl she named first photo of her baby alongside Duff and her boyfriend Matthew Koma.