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The pop star is reportedly taking boxing lessons from Floyd Mayweather ... and Conan O'Brien has the footage.
The breakthrough newcomers 5 Seconds of Summer will also take the stage at next month's American Music Awards.
Good ol' boys John Schneider and Tom Wopat have teamed up to record a new holiday album.
LeAnn Rimes, Betty White, Scarlett Johansson, Josh Duhamel, and Kesha are among those set to appear on a "Dog-a-Thon."