Cathedral workers have been instructed not to even make eye contact with the stars on set, reported Contactmusic.
"Staff and volunteers at the cathedral have each received a memo instructing them not to bother the stars, or even make eye contact. It is a real coup for Ely having someone like Mila filming and they realise how important it is to let her get on with her work without being bothered by overexcited choristers," said a source.
"She and Channing have been squirrelled away, and they are
being smuggled in so they cause as little bother and distraction as possible. Much of the cathedral has been closed down as well to ensure filming continues seamlessly," added the source.