Ashanti is officially back together with Nelly.

But that hasn't stopped her from having some fun with the girls.

In the video below, the 42-year-old and her mom -- who looks a lot younger than her age of 60 -- Twerk around in a bowling alley.

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In addition to being Ashanti's mother, Tina Y. Douglas is Ashanti's manager.  So maybe that was official business.