Whitney Houston's daughter, Bobbi Kristina Brown, is officially engaged to her boyfriend Nick Gordon.

She initially announced the news on her Instagram page during the Fourth of July weekend holiday. But on Wednesday (July 10), the 23-year-old took to her Facebook page to fire back at people criticizing their relationship.

Some folks believed that Nick Gordon is Kristina's adopted brother, which, according to Kristina, is not true. In an open letter, Kristina denies that Gordon is her stepbrother and says her mother encouraged their relationship.

She writes:

I'm tired of hearing people say ‘eww your [sic] engaged to your brother or if Whitney was still alive would we be together or would she approve of this.’ Let me clear up something, we aren't even real brother and sister nor is he my adoptive brother. My mom never adopted him. In fact, mommy was the one who even said that she knew that we were going to start dating. People need to seriously stop judging my relationship."

The groom-to-be Nick Gordon has been part of Houston’s family since the age of 12 and was raised alongside Kristina. Obviously, the couple grew especially close after the pop icon's death in February 2012.

We wish Kristina and Gordon all the best in their relationship.

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