Pope Francis collected the key Papal symbols for his inauguration from the tomb of St Peter, under the high altar of the Basilica.
Cardinals then streamed out into St Peter's Square, followed by Pope Francis, for the start of the public ceremony.
Pope Francis appeared to thoroughly enjoy his drive through the crowds in St Peter's Square on his way to the Basilica.
Crowds at the Vatican are certainly smaller than authorities had planned for the inauguration.
Up to a million had been forecast to flock to Rome for the ceremony.
Pope Francis' 20 minute tour of St Peter's Square has just ended.
Now he is preparing for Mass, collecting Pallium and Fishermen's Ring in the Basilica.
A baby is picked up from the crowd and passed to Pope Francis, who kisses it.
The baby appears to scream. He smiles.
Soon the Pope was down on the ground, greeting a family and blessing their disabled child.
Pope Francis is currently touring St Peters Square, stood on a convertible 'popemobile'.
A lot of waving and smiling from the crowds.
It is going to be an incredible mix of tourists, locals, dignitaries and pilgrims cramming into St Peter's Square today.
The way the pope arrives will be a crucial sign of how he wants to be seen.
It is thought he may ditch the pope mobile at some point, get out and walk, talk and touch the people who have come here to get a glimpse of him.