(@REALbkBrown)

Whitney Houston's daughter, Bobbi Kristina, appears to be getting even closer to her adopted brother Nick Gordon.

Bobbi Kristina posted a photo on Aug. 10 to her Instagram account of the pair kissing. The aspiring actress also showed off a diamond sparkler on her ring finger, which she has been spotted wearing since her mother's death earlier this year.

"1 of the main reasons why i even smile today.:) iloveyoubooboo , forever&always. "it's just US now".. @ Nickdgordon {<3}," she tweeted alongside the photo.

Earlier that day, Bobbi Kristina posted a photo of the pair embracing, tweeting, " & still through those trials&tribulations the devil kept on trying to break them& soon realized… He couldn't."

On Aug. 8, what would have been the eve of Houston's 49th birthday, the pair got matching tattoos on their wrists of Houston's initials and four doves.

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

The pair sparked dating reports earlier this year when they were spotted holding hands, with Bobbi Kristina again sporting her mom's diamond sparkler on her ring finger.

Gordon told ABCNews.com in March that they were not dating.

"We're just close - just going through her mom's passing and grieving together," he said.

Gordon was first noticed at Houston's funeral, sitting alongside Bobbi Kristina. According to sources close to the family and a TMZ report, Houston invited Gordon to live with her more than 10 years ago after learning that his birth mother could no longer care for him.

A source close to Houston told ABCNews.com in March that Gordon was never legally adopted by the singer nor was he left anything in her will. Instead, Houston left her entire estate to her only child, Bobbi Kristina Brown, who has to wait until she's 30 to inherit everything.

Bobbi Kristina is currently working on the reality series "The Houston Family Chronicles," set to debut on Lifetime in September. She also recently guest starred on Tyler Perry's sitcom "For Better or Worse."