It's official: Chief Justice John Roberts will swear in President Obama for his second term.

The Presidential Inaugural Committee announced Friday that Obama has selected Roberts to administer the oath of office later this month. The president gets to pick who administers the oath of office, and, historically, the Chief Justice on the Supreme Court has almost always done the honors.

"I will be honored to again stand on the Inaugural platform and take part in this important American tradition," Obama said in a statement. "I look forward to having Chief Justice John Roberts administer my oath of office as we gather to celebrate not just a president or vice president, but the strength and determination of the American people."

We suspect Roberts is practicing -- four years ago, Roberts stumbled over the oath, forcing a redo the next day at the White House.

This year, Roberts will again swear in Obama twice -- first in a small White House ceremony at noon on Jan. 20, the constitutionally mandated start of Obama's second term.

Because Jan. 20 falls on a Sunday, the public inauguration ceremony takes place at the U.S. Capitol on Monday, Jan. 21.

Vice President Biden, meanwhile, will be sworn in by Supreme Court Justice Sonia Sotomayor, who was nominated to the high court by Obama.

From the Presidential Inaugural Committee:

"President Obama followed presidential precedent in choosing the Chief Justice to administer his oath of office.

"Historically, Inaugural Ceremonies are not held on a Sunday because Courts and other public institutions are not open. This year, in accordance with the requirements of the United States Constitution, President Obama and Vice President Biden will officially be sworn in on Sunday, January 20, 2013.

"The following day, Monday, January 21, 2013, a ceremonial swearing-in that is open to the public will take place on the West Front of the United States Capitol."

USA Today