Grace Hightower has been named honorary battalion chief by the FDNY. Robert De Niro’s wife was sworn in by Fire Commissioner Salvatore “Sal” Cassano on Thursday night. We’re told that in her new role, she’ll be helping to raise awareness about fire safety and prevention, as well as helping raise funds for the FDNY Foundation. Several weeks ago, Page Six exclusively reported that the acting legend and Hightower personally stopped by Engine Co. 23 on the Upper West Side to thank firefighters for extinguishing the June blaze at their Central Park West apartment and treated them to lunch from De Niro’s Tribeca Grill restaurant downtown.