Pope Benedict XVI celebrates holy mass at St. (Credit: Getty Images)

Pope Benedict XVI celebrates holy mass at St. Peter's Square.

Pope Benedict XVI

Pope Benedict XVI celebrates holy mass at St.
(Credit: Getty Images)

Pope Benedict XVI celebrates holy mass at St. Peter's Square.

Pope Benedict XVI meets Germany's Thuringia Minister-President Dieter
(Credit: AP Photo)

Pope Benedict XVI meets Germany's Thuringia Minister-President Dieter Althaus at the Vatican.

Pope Benedict XVI acknowledges cheers from faithful and
(Credit: AP Photo)

Pope Benedict XVI acknowledges cheers from faithful and pilgrims as he leaves St. Peter's square at the Vatican.

Pope Benedict XVI waves to belivers gathered in
(Credit: Getty Images)

Pope Benedict XVI waves to belivers gathered in the courtyard of his Summer residence in Castelgandolfo.

Pope Benedict XVI arrives to celebrate mass in
(Credit: Getty Images)

Pope Benedict XVI arrives to celebrate mass in St Peter's Square to mark the third anniversary of the death of pope John Paul II at the Vatican.

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Pope Benedict XVI joins his hands during the
(Credit: Plinio Lepri, Associated Press)

Pope Benedict XVI joins his hands during the Regina Coeli address, delivered from the balcony of the pontiff's summer residence in Castel Gandolfo, on the outskirts of Rome.

Pope Benedict XVI, sporting a fur-trimmed hat in
(Credit: AP Photo)

Pope Benedict XVI, sporting a fur-trimmed hat in the rich red color of a Santa hat, arrives in St. Peter's Square at the Vatican for his weekly general audience in December of 2005.

Pope Benedict XVI waves from his pope mobile
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Pope Benedict XVI waves from his pope mobile as he is driven through the crowd at St. Peter's Square for his weekly general audience, at the Vatican.

Pope Benedict XVI waves from the popemobile as
(Credit: AP Photo)

Pope Benedict XVI waves from the popemobile as he arrives for the opening mass of the V Latin American Episcopal Council in Aparecida, Brazil.

Pope Benedict XVI meets Srgjan Kerim (L), President
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Pope Benedict XVI meets Srgjan Kerim (L), President of the United Nations General Assembly during a private audience at the Vatican in March, 2008.

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Pope Benedict XVI presides over his weekly audience
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Pope Benedict XVI presides over his weekly audience in St Peter's Square in Vatican on March 26.

Pope Benedict XVI welcomes Saudi Arabia's King Abdullah
(Credit: AP Photo)

Pope Benedict XVI welcomes Saudi Arabia's King Abdullah at the Vatican in 2007.

Pope Benedict XVI Wednesday greets a crowd gathered
(Credit: AP Photo)

Pope Benedict XVI Wednesday greets a crowd gathered in front of his former private home in Rome. Generally the pope is said to be in good health, but he has had some physical problems.