St Peter's Square in Rome this morning. Cardinals are entering the conclave today to decide on who becomes the next pontiff. Photograph: Spencer Platt/Getty Images
Different sizes of papal vestments hang ready for use at the Sistine Chapel in advance of the conclave. Tailors delivered three different sizes of white vestments - small, medium and large - confident that whoever becomes pope will be able to find a garment to fit him before stepping out onto the balcony. Photograph: Osservatore Romano/Reuters
Cardinal Francis Arinze (80) of Nigeria exits St Peter's Basilica in Rome after he attended the Pro Eligendo Romano Pontifice Mass before he and the other Cardinals will enter the conclave to decide who the next pope will be. Photograph: Spencer Platt/Getty Images
Nuns sing hymns under the colonnade in St Peter's Square in Rome today. Photograph: Dan Kitwood/Getty Images
Nuns pictured under the colonnade in St Peter's Square in Rome today. Photograph: Dan Kitwood/Getty Images
A Swiss Guard stands near the entrance of St Peter's Basilica during the Pro Eligendo Romano Pontifice Mass in Rome today. Photograph: Spencer Platt/Getty Images
Cardinals attend a mass in St. Peter's Basilica to pray for the election of the new pope. Photograph: Stefano Rellandini/Reuters
Cardinals exit St Peter's Basilica before entering the conclave today in Rome. Photograph: Spencer Platt/Getty Images
Cardinals exit St Peter's Basilica after the Pro Eligendo Romano Pontifice Mass in Rome. Photograph: Spencer Platt/Getty Images