The homeless, most of who live in shelters run by Mother Teresa's Sisters of Charity order, came to Rome overnight on buses from across Italy to take part in Sunday's Mass.
They're getting seats of honor for the celebration and will then be served lunch in the lobby of the Vatican auditorium.
A Neapolitan pizza maker brought 20 people and three pizza ovens to cook the lunch, which will be served to the guests by some 250 sisters and priests of the Sisters of Charity order.
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