bobbi kristina*Now it’s gettin’ juicy.

TMZ is reporting that Miss BK, Bobbi Kristina, isn’t fazed by Grandma Cissy’s accusations she’s committing incest by hooking up with her “adopted” brother Nick Gordon.

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She’s telling friends, she’s gonna let  it do what it do.

In other words, it’s HER prerogative.

Sources close to BK tell TMZ, the 19-year-old finally ‘fessed up to her close buddies … she and 22-year-old Nick Gordon are dating — ten years after Whitney unofficially adopted the boy because he was having problems at home.

TMZ broke the story … Bobbi’s grandma Cissy Houston saw the video we posted (see below) — showing Bobbi and Nick holding hands and kissing on a lunch run in Atlanta this week — and told a close friend, “What [Bobbi and Nick] are doing is incestuous.”

But Bobbi couldn’t care less — telling friends … she doesn’t give a damn about what Cissy thinks about her controversial relationship … and because Nick’s not her blood brother, she definitely doesn’t consider it incest.

As one source put it — Bobbi “can’t please everyone, so she is going to please herself by doing what she wants to do for once.”

As for the maybe engagement ring Bobbi was wearing — we’re told she’s been mum on what it means … but cryptically told friends, she and Nick ARE planning a trip to Vegas in the near future.

In other words, it’s HER prerogative.