Flash mobs usually pay homage to musicians who are no longer with us -- or at least ones who aren't right there -- but the Janet Jackson mob this weekend had a very special guest ... Janet herself!
But it wasn't a coincidence -- it was all to promote Janet's greatest hits album, which comes out Tuesday.
Still cool though.
Janet Jackson Watches Janet Flash Mob
11/16/2009 7:00 AM PST BY TMZ STAFF
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