Avril Lavigne scores her second No. 1 on The Billboard 200 as her third album "The Best Damn Thing" bows on top. The RCA set moved 286,000 copies in the United States, according to Nielsen SoundScan, short of the 381,000 that greeted her first chart-topper, 2004's "Under My Skin." Sales were fueled by her current single, "Girlfriend," which ascends 3-1 on tomorrow's Billboard Hot 100.