The Jonas Brothers are expected to reign supreme at the box office over the weekend with their Jonas Brothers The 3D Concert . Box-office observers have suggested that the 3-D film could exceed the opening of last year's similar Hannah Montana/Miley Cyrus Best of Both Worlds release -- also in 3D -- which pulled in $31.1 million in its first weekend and wound up with $65.3 million after a time-limited release. (It was originally scheduled to run one week only.) The film, playing in 1,271 theaters equipped with digital 3D projectors, is also benefiting from additional screenings that began at midnight. "I don't see the launch as being as frenetic, because people know they have opportunity to see it over the next few weeks," Disney distribution chief Chuck Viane told the Hollywood Reporter. (In a surprise appearance, the Jonas Brothers themselves put on a performance at one of the midnight screenings in Los Angeles Thursday night/Friday morning, delighting kids who stayed up past their bedtime to see the movie. Disney billed the performance as the first stop on the brothers' "Surprise Theater Invasion Tour" of movie theaters across the country over the next days.) Also opening this weekend is Fox's martial-arts flick Street Fighter The Legend of Chun-Li , which was not screened for critics. It is expected to earn about $5-7 million. Opening in Los Angeles and New York only is Crossing Over , which attempts to deal with the issue of immigration post 9/11.

CORRECTION In Thursday's Studio Briefing, we indicated that the Jonas Brothers concert movie would be competing against the highly anticipated Watchmen . While Warner Bros. and Paramount have scheduled numerous sneak previews of Watchmen during the coming week, it does not officially open until March 6. Meanwhile, a trade review by Kirk Honeycutt in the Hollywood Reporter predicts that the film will experience a "drastic" slide after a big opening weekend and concludes "Looks like we have the first real flop of 2009."