TMZ.com: Demi Lovato's Ex-Fiancé Max Ehrich Allegedly Battered His Mom, Inhaled Nitrous - DEMI LOVATO'S EX-FIANCÉ MAX EHRICH POSES FOR STONE-FACED MUG SHOT ... After Allegedly Roughing Up Mom ... Crazy new details in the arrest of Demi Lovato's ex-fiancé Max Ehrich have surfaced ...