Making good on their promise of an epic performance, Fall Out Boy performed "Trap Queen" alongside rapper Fetty Wap.

The band posted this Instagram snap of Pete Wentz in anticipation of their performance:

Promised to be an epic comeback, (Fall Out) BOY did they deliver! No expense was spared on their incredible raised staging, smoke machines, lighting - reminiscent of their noughties heydey.

On the back of their sixth studio LP, American Beauty/American Psycho, we really hope the band are back for good!

Watch the performance LIVE now or in the repeat screenings 6:30pm tonight on MTV!