Actor Josh Duhamel (photo) says he believes his North Dakota hometown will rebuild from a devastating flood, and on Saturday he shared that hopeful message with thousands of people attending a benefit concert he helped plan. Images of flooded Minot, N.D., neighborhoods appeared on large video screens as Duhamel, 38, spoke on stage about the city’s recovery efforts in between performances from Minneapolis-based rockers Charlz Newman and headlining act The Black Eyed Peas. His wife, Fergie, is a Black Eyed Peas member. The concert in Minot was sold out, with more than 12,000 tickets going for $100 each. Duhamel said money from the Minot Rising show and a recovery fund will help buy materials for people rebuilding their homes. … Green Day front man Billie Joe Armstrong says his sagging pants cost him a seat on a Southwest Airlines flight. The singer-guitarist sent a message to his Twitter followers Thursday expressing his indignation at being tossed from an Oakland-to-Burbank flight for wearing his trousers too low. An ABC7 news producer who was on the same flight told the station that a flight attendant approached Armstrong as the plane was getting ready to take off and asked him to hike his pants higher. Armstrong initially responded by asking the attendant if there weren’t “better things to do than worry about that?” But the attendant persisted and told Armstrong he could be ejected for his refusal to comply. When Armstrong insisted he was just trying to get to his seat, he and a traveling companion were taken off the plane. A Southwest spokesman later said Armstrong was allowed onto the next flight to Burbank and had told a customer relations agent who contacted him he had no further complaints.