Fall Out Boy Joined By Hayley Williams for "Sugar, We're Going Down"

Fall Out Boy and Paramore wrapped up their co-headlining MONUMENTOUR last night (August 31st) in Scranton, PA.

The pop/rock four-piece were joined by Paramore vocalist Hayley Williams to perform their 2005 hit single, "Sugar, We're Going Down."

A fan-shot recording of the band's performance can be viewed below.