While the Jonas Brothers have virtually fizzled out as a group, individually, the brothers are 'Burnin' Up' and are hotter than ever. Heartthrob Joe Jonas and British hitmaker Jay Sean are preparing to take the US by storm on a 19-date tour slated for this fall.

The boys (okay, men) have managed to pack nearly 20 shows into exactly a month. The first pair-up will run Sept. 6 in Boston and Jonas and Sean will round it out back in New York to close the tour on Oct. 6, hitting big cities like Los Angeles and Chicago along the way.

Jonas -- who turned the big 22 just yesterday --  should have no problem selling copies of his forthcoming 'FastLife' album with all of the big tours he's rolling out. Following the wrap of the Jay Sean shows, the middle Jonas will hit the road with Britney Spears for the European leg of her  Femme Fatale tour, which starts Oct. 16.

Jonas' 'FastLife' solo effort impacts on Oct. 11. Tickets for the Jonas/Jay Sean jaunt go on sale Friday, Aug. 19, via Ticketmaster.