It's a remarkable comeback for a band dismissed as dead and buried just a few years ago.
Last month, we spent the day with the group as it drove across Florida – from Jacksonville to St.
Wentz reportedly attended the wedding with model girlfriend Meagan Camper.
"We asked ourselves, 'What would we want if the Smiths or someone like that reunited? "We'd want a new album, new song, a tour right away and don't just go play state fairs." But new tunes would mean a new sound.
"We thought that was the end of radio for us," Stump said.
One of pop's most unlikely comeback stories, Fall Out Boy, have successfully transitioned from their old punk roots to dance music, and stayed on top of the charts while doing so.
The group faded away after their 2008 album, , failed to match sales numbers from their previous efforts.