Here's what's happening today in pop culture:
• Katy Perry and One Direction each won three trophies at Sunday's American Music Awards, with the British boy band taking Artist of the Year. [Vulture]
• Katy Perry was named the headliner of the Super Bowl XLIX halftime show, making official what had been known for a month. [Entertainment Weekly]
• "The Hunger Games: Mockingjay, Part 1" had the biggest opening of the year, at $123 million — but that's well below the $158 million opening for the previous chapter, "The Hunger Games: Catching Fire." [Box Office Mojo]
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