Katy Perry’s not only keeping all the cash she made during her marriage to Russell Brand — she’s also taking back her maiden name … according to new divorce docs.Katy’s response to Russell’s divorce filing — filed yesterday and obtained by TMZ — states the ex-couple reached a “comprehensive written settlement.” As we first reported, that includes Russell passing on their community property — aka 50% of Katy’s approximate $40 million in earnings.  The doc also includes a check next to the box — “Respondent’s [Katy’s] former name be restored to.”  It goes on to specify her full name … Katheryn Elizabeth Hudson.  Most amicable Hollywood divorce. Ever.

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