Former US President Barack Obama and former first lady Michelle Obama hold hands between their portraits during an unveiling ceremony at the Smithsonian's National Portrait Gallery in Washington, DC. Photograph: Jim Bourg/Reuters

Artist Kehinde Wiley and former US President Barack Obama unvei Obama's portrait. Photograph: Jim Bourg/Reuters

Artist Amy Sherald and former first lady Michelle Obama at the unveiling of Mrs Obama's portrait. Photograph: Jim Bourg/Reuters

Barack Obama stands between painted portraits of himself and that of former first lady Michelle Obama during the unveiling ceremony. Photograph: Jim Bourg/Reuters

Barack Obama holds hands with wife Michelle Obama prior to the the unveiling of their portraits. Photograph: Jim Bourg/Reuters

Artists Amy Sherald and Kehinde Wiley gather with actor Tom Hanks at the unveiling of their painted portraits of the Obamas. Photograph: Jim Bourg/Reuters

Former US Vice President Joe Biden and actor Tom Hanks talk to members of the audience after the portrait unveiling ceremony. Photograph: Jim Bourg/Reuters

Director Steven Spielberg and actor Tom Hanks talk at the unveiling ceremony. Photograph: Jim Bourg/Reuters