SNL

"I am you from the future and I came here to stop you from partying tonight."

Ashlee Simpson is just one of many stars who bungled sets on TV's most coveted stage.

Watch BTS perform 'Boy With Luv' and more on 'Saturday Night Live.'

BTS will perform on 'Saturday Night Live.'

Halsey is booked to perform on and host an upcoming episode of 'SNL.'