After a two hour mass there is a chance for the crowds to pick up a Pope Francis souvenir and show their love.
Baroness Warsi, who attended the inauguration of Pope Francis in Rome, has tweeted her response to the ceremony:
The Minister for Faith and Communities joined Cabinet colleague Kenneth Clarke in representing the British government at the inauguration.
Pope Francis has ended his inaugural homily with a request to his Christian followers to "pray for me".
He said his role as the Bishop of Rome is to bring hope by service to their faith.
The "authentic power is service" he said, adding that kindness and compassion is "not a sign of weakness".
Pope Francis has received applause as he paid tribute to his predecessor Benedict XVI during his homily, given in Italian, in front of the audience at St Peter's Square.
He sent Benedict XVI "prayers, affection and thanks".
Marking the feast of St Joseph today, Pope Francis said Christians must listen to God to "protect Christ in our lives so we can protect others".
Today's ceremony at St Peter's Square in Rome is being streamed live:
A young boy with a beautiful voice has sung a solo to the gathered crowds in St Peter's Square, and the millions watching worldwide. No pressure...