Barack Obama will officially be sworn in as president of the United States.

Today is a historic day for our country. Barack Obama has taken the Presidential oath of office on the Bible Abraham Lincoln used. Take a look at our First Family gallery.

He rested his left hand on the tome, which was borrowed from the Library of Congress, and (with a couple of hiccups!) recited his 35-word oath ... thus ushering in a new era.

Click to see more of the First Family!