Judge Sonia Sotomayor was sworn in on Saturday as the first Hispanic associate justice on the US Supreme Court.
With her left hand on a Bible held by her mother, Sotomayor swore to "administer justice without respect to persons and do equal right to the poor and to the rich."
The oath was administered by Chief Justice John Roberts.
It was the second swearing-in of the day for Sotomayor who emerged from a modest childhood in New York City to become only the third woman to serve on the high court.
An earlier, off-camera ceremony was followed by a televised event in a conference room at the Supreme Court. Sotomayor's mother, Celina, and her brother, Juan Luis Sotomayor, stood beside her during the administration of the public oath.