Getting down to work in Berlin, German, Katy Perry was spotted arriving at Detlef “D” Soost’s dance center for a rehearsal today (November 3).

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Katy Perry: Berlin Babe

Getting in touch with her inner-bookworm, Leighton Meester was spotted at the 2009 Library lions Benefit last night (November 2) in New York City.

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Leighton Meester: Library Lions Lady