Donald Trump Sworn in as 45th POTUS

Donald Trump was sworn in Friday as the 45th President of the United States at the U.S. Capitol.

The oath itself went off without a hitch ... however, Prez Trump's speech -- filled with images of an America in ruins -- seemed to rub the Obamas the wrong way. It was written all over their faces.

As for 16-year-old Jackie Evancho's 'Star Spangled Banner' -- flawless.

Attendance wasn't quite the record-setter the new POTUS hoped it would be. Looks like Barack gets to hold on to his 2009 record ... which was estimated to be about 2 million.