Billboard is reporting that the Backstreet Boys have already started working on the follow-up to last year’s ‘Unbreakable’. The group has already recorded some new material for their sixth studio album while on their European tour and plan to hit the studio again after their tour of North America which kicks off on Tuesday in St. John’s, Newfoundland and wraps up on September 6 in Seattle. Howie Dorough says “We’re looking at getting back into the studio quite quickly. We want to hopefully have something ready to go or at least be heavily into it by the end of the year and have something out towards the beginning of next year.”