Popsugar Entertainment Jonas Brothers Jonas Brothers Reunion Details New Music, a Documentary, and a Memoir: All the Details About the Jonas Brothers Reunion June 1, 2019 by Kelsie Gibson First Published: March 7, 2019 View On One Page Photo 8 of 21 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 8 March 6: Jonas Brothers Discussed the Side Effects of Forming a Band With Your Siblings During The Late Late Show, the brothers poked a little fun at each other during a segment called "Side Effects May Include." Read More Previous Next Start Slideshow MusicJonas Brothers