Bobbi Kristina Brown confirms she and Nick Gordon have transitioned … from “adopted” brother and sister to husband and wife — but Whitney Houston’s daughter says they got permission from grandma first.

BK and Gordon were doing the newlywed strut in Atlanta Friday … when a photog asked about their recent nuptials.

The couple was tight lipped on details — except to hint about a big upcoming ceremony — but they added … Cissy Houston OK’d the marriage before they did the deed.

And then they made out. Gross.

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