MONDAY NIGHT !!!
Peyton and Eli Manning really are getting "everybody" to help promote their popular "Manningcast" show ... enlisting none other than the Backstreet Boys to remix one of their biggest songs for the two NFL legends ahead of the new season!!
TMZ Sports has obtained a clip of Brian, AJ, Nick, Howie and Kevin giving an a cappella rendition of their mega hit, "Everybody" ... but instead of the famous lyrics we've all belted out over the past 27 years, they swapped them out for some Manningcast-themed lines.