Currently in the midst of a European roadtrip, pop-rockers the Jonas Brothers [ tickets ] continue filling the cracks in their ambitious North American tour schedule.Due to launch on the Fourth of July, the outing now includes a two-night stand in Anaheim, CA; a one-off engagement in Baltimore; a third night at New York City's Madison Square Garden; and September dates set in University Park, PA; Tampa; and West Palm Beach, FL.As previously reported, teen singer/songwriter Demi Lovato will tag along as the opening act during the run, which is set to visit more than 40 cities. The itinerary is included below.The group's jam-packed tour schedule will couch the Aug. 12 release of the siblings trio's third album, "A Little Bit Longer, which features leadoff single "Burnin' Up." The Jonas Brothers co-wrote all the new songs and recorded much of the album on the road in a specially outfitted Gibson tour bus. John Fields returns as executive producer.The new record follows the band's platinum-selling, self-titled sophomore set, which debuted last August at No. 5 on The Billboard 200. That album has spawned pop hits including "S.O.S.," "Hold On" and "When You Look Me in the Eyes." In addition to their musical pursuits, the Jonas Brothers--20-year-old Kevin, 18-year-old Joe, and 15-year-old Nick--also have several other projects on their plate. They star in the upcoming Disney Channel Original Movie "Camp Rock," which premieres June 20, as well as the Disney Channel series "J.O.N.A.S!," set to debut this fall.Next year, the guys will head to the big screen for a Disney Digital 3-D flick capturing the "Burnin' Up" concert tour.