Pope Benedict XVI leads a Mass for late Pope John Paul II's beatification, in St. Peter's Square at the Vatican, Sunday, May 1, 2011. Standing in front of him are sisters Tobiana and Marie Simon-Pierre. The Vatican has decreed that Sister Marie Simon-Pierre's inexplicable healing was the miracle needed to beatify John Paul, a process that will reach its culmination Sunday during a Mass in St. Peter's Square celebrated by Pope Benedict XVI. (AP Photo/Andrew Medichini)