Bobbi Kristina talks about dating her "brother"

Bobbi Kristina Brown has stopped being shy about her relationship with Nick Gordon. Whitney Houston's 19-year-old daughter, who grew up alongside Gordon after her mother informally adopted him, has caught some flack in recent months for dating her "brother." (The two are not biologically related.) On Friday, Bobby Kristina proved that their relationship is still going strong by posting a Twitpic of herself and Gordon kissing.

"1 of the main reason why i even smile today.:) iloveyoubooboo, forever&always. 'it's just US now'," Bobbi Kristina tweeted along with the picture.

In the photo, Brown shows off a giant diamond ring, which has reignited rumours that she and Gordon might be secretly engaged.

The lovey-dovey photo comes just days after Bobby Kristina and Nick made another declaration of love: matching tattoos. On Aug. 9, in honour of Whitney's birthday, she and Nick each had the initials "WH" inked on their arms, surrounded by four doves.

"Tat tat tatted YURP..;) now your truly ALWAYS with us mommy (: we love you @nickdgordon always&forever{<3}," Bobbi Kristina tweeted alongside a photo of her new tattoos.

The young couple went public with their relationship in March, one month after Whitney died of accidental drowning related to cocaine use. Their still-controversial relationship will be documented on The Houston Family Chronicles, Bobbi Kristina's reality series, which is set to link to premiere on Lifetime later this year.