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Bobbi Kristina Brown and boyfriend Nick Gordon. Image Credit: Twitter.com

They lived like brother and sister for over a decade before Whitney Houston’s tragic death.

But Bobbi Kristina Brown not only kissed and professed her love for brother-turned-partner Nick Gordon over Twitter this weekend, she also showed off a mysterious diamond sparkler on her left ring finger.

The 19-year-old had gotten matching “WH” wrist tattoos with Gordon last week in honour of what would have been her mother’s 49th birthday, but the loved-up pair were eager to show their love to all 95,000 of the singer-turned-actor’s followers.

“1 of the main reasons why i even smile today.:) iloveyoubooboo, forever&always. ‘it’s just US now’...@Nickdgordon {<3}” Brown tweeted along with the kissing picture.

According to TMZ, Brown and Gordon grew up together after Houston took him in at the age of 12 when his father went to prison and his mother was unable to take care of him.

Gordon was the singing superstar’s unofficially adopted son, and she treated him like family up until her death at the age of 48 due to an accidental drowning complicated by heart disease and cocaine use.

The 22-year-old first fuelled rumours about their relationship status in a tweet written last March, exclaiming: “Yea we got a little closer and what!!!”

The controversial couple have reportedly been sharing her $1.2 million (Dh4.4 million) Atlanta home together ever since.

“No matter what...This connection between us will #STAYSTRONG 4EVER! We will love & miss u 4ever lady:)” Kristina wrote, adding, “& still through those trials & tribulations the devil kept on trying to break them & soon realized...He couldn’t.”

By the age of 30 Kristina will have inherited everything that belonged to her iconic mother — money, jewellery, cars, etc.

She recently did a guest stint on Tyler Perry’s sitcom For Better Or Worse.

And the mourning starlet is currently filming her blooming love for Gordon on her upcoming reality show, The Houston Family Chronicles, which is set to premiere on Lifetime next month.

Brown was seen clutching Gordon’s thigh while they watched the Billboard Music Awards together back in May, and the teenager was seen wearing the same diamond sparkler that night.

The duo batted away rumours of an engagement shortly after and last month, according to Hollywood Life, they both decided it wasn’t the right time to wed.

“Bobbi and Nick really love each other,” said a source.

“But they just can’t figure out how they want to define their relationship. Bobbi felt like she got swept up in the moment because she was going through a lot of emotions after Whitney’s death. But they’re in love and still together, just not engaged.”

Brown’s grandmother, Cissy Houston, has branded their relationship “incestuous” in an interview with TMZ.

Despite family feuds over the matter, the Houstons are expected to unite later this month to honour Whitney’s memory with the posthumous release of her final feature film, Sparkle.