50 Cent brings out Ed Sheeran at his Final Lap Tour in London

Tuesday night (November 21) at 50 Cent ‘s “Final Lap” event at London’s O2 Arena, fans were treated to a very special surprise guest. During his performance a giant box on stage flashed the message “there’s a monster in this box,” as the familiar strains of Ed Sheeran‘s “Shape of You” filled the arena and Fif said “turn it up even more!”

Ed then popped out from under the box — without his signature acoustic guitar — and began singing his 2017 smash while dapping up 50 who added some ad libs and joined the clearly excited Sheeran on the chorus. Sheeran chronicled the special moment on his Instagram Story, writing, “50 Cent has invited me to the O2 to sing ‘Shape of You,’” along with footage of himself walking around beforehand backstage singing to 50’s “21 Questions.”

Though they were in all-white on stage, 50 posted some backstage images of the men in all black yukking it up with the message, “My man came through for me tonight, BOOM, LONDON went crazy! It don’t get bigger than this.”

Sheeran also previewed his walk-out in an Instagram Live video shared by 50, in which the singer tells the camera, “50 Cent has invited me to the O2 to sing ‘Shape of You,’ and I’m going to walk on stage and go, ‘Who likes ‘In Da Club?… Here’s ‘Shape of You.’” Ed then sings a bit of 50’s “21 Questions” before a stagehand loads him into the lift that positions him inside the box as he yells “In Da Club!”

Afterwards, a hyped Sheeran can’t stop yelling “In Da Club!” as he leaves the stage and retreats to a sky box to watch the show and rap along to “Many Men” and, of course “In Da Club.”