Killer week for Rae Sremmurd -- first "Black Beatles" hits #1, and now the guys pull off TMZ's very first Mannequin Challenge! Yeah, we're late bloomers.
It just went down at the Delta check-in counter at LAX. Our pap, Charlie, popped the question and Swae Lee and Slim Jxmmi sprung into inaction.
Shout-out to the Delta staff and the older dude standing in line, who happily played along. It's historic!