UPDATED 5:02 p.m. ET
Chief Justice John Roberts administered Sotomayor the oath of office at the event, known as an investiture – the traditional ceremonial welcoming of a new justice. The oath of office was essentially for show, however, as Sotomayor was sworn in back on August 8th.
After receiving the oath, Sotomayor took her seat at the end of the bench, according to seniority.
"We wish you a long and happy career on our common calling," Roberts told the new justice, who wore a white blouse under her judicial robe.
Sotomayor was also joined by her mother (pictured at left with the justice), her brother John, entertainer Ricky Martin, Attorney General Eric Holder, members of Congress, judges and others at the ceremony, according to the Associated Press. Also present was the justice Sotomayor is replacing, David Souter.
(At left: The official White House photo of President Obama talking with Sotomayor prior to her investiture ceremony.)