Katy-Gaga numbers for AM

HOT DIVA-ON-DIVA ACTION: In the battle of the Q4 sirens, Capitol’s Katy Perry enjoys a decided advantage in single sales—her “Roar” has moved 1.5 million in just three weeks, nearly three times those generated by “Applause,” the first single from Interscope’s Lady Gaga. But with 45k+ in preorders, Gaga’s forthcoming ARTPOP (due out 11/11) has more than triple the numbers Katy has scored thus far for Prism (which streets 10/22). You’ll recall that Katy’s last album sold 2.7m, while Gaga moved 2.3m. Handicappers are handicapping 400k bows for both. It’s still early days, so beware sweeping conclusions about these numbers—a lot can happen between now and when we finally dip into the eggnog. Stay tuned for more geek-friendly stats from the fourth-quarter horse race. (9/4a)