Sources tell us the 2 pop stars are planning a tribute for police officers, fire fighters, paramedics, disaster relief teams and everyone in between who shows up at the first sign of trouble to kick off the program Sunday evening.
We're told there will be a photo montage displaying pics of different scenarios where first responders were crucial this year -- including at shootings, hurricanes, fires, floods and other natural disasters that befell the country in 2017.
Sources say it's being planned to be an incredibly powerful and emotional moment in the show -- so much so, that it even got standing ovations during dress rehearsal.
Jamie Foxx introduced the pair before they launched into a duet of R.E.M.'s "Everybody Hurts."