Bobbi Kristina Brown was wearing a ring on her engagement finger as she stepped out with Nick Gordon

Bobbi Kristina Brown was spotted this week stepping out in public for the first time with her “adopted” brother, the man who is healing her broken heart in the wake of her mother’s death.

Bobbi Kristina Brown, 19, who was sporting a ring on her wedding finger, is rumored to be secretly engaged to Nick Gordon, 22.

Their union, however, is causing concern for some – with Bobbi kristina’s grandmother Cissy Houston having apparently branded their relationship incestuous.

Bobbi Kristina and Nick Gordon were spotted on Tuesday visiting Romeo’s Pizza restaurant in their hometown on Atlanta, Georgia.

In a public declaration of their love, Bobbi Kristina and Nick Gordon were seen kissing and holding hands as they put on a tactile display.

Bobbi Kristina Brown was also wearing a large ring on her engagement finger amid reports they have secretly got engaged.

Despite the pair not actually being blood relatives, Bobbi Kristina and Nick Gordon grew up together after Whitney 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.

However, Cissy Houston said that Bobbi Kristina and Nick Gordon’s romance still constitutes wrongdoing, telling TMZ.com: “What they’re doing is incestuous.”

Cissy Houston is also quoted as telling the website that she believes Nick Gordon is taking advantage of Bobbi Kristina and her issues.

It was also claimed that Cissy Houston has even requested that the Whitney Houston Estate get involved in an attempt to get him evicted from Whitney’s $1.2 million Atlanta townhouse, where he is apparently currently living alongside Bobbi Kristina.

Meanwhile TMZ reports that Bobbi Kristina is not listening to her grandmother and the website reports she is telling friends she doesn’t care what her family thinks.

A source told TMZ that Bobbi Kristina: “Can’t please everyone, so she is going to please herself by doing what she wants to do for once.”

A family friend told this week’s Star magazine how Nick Gordon proposed to Bobbi Kristina over the weekend.

“Nick proposed to Krissy on March 10, and she said yes,” the family relative confirmed.

“Krissy said Nick is the only person she trusts in the world. They have a very deep connection.”

TMZ also claims friends of the couple believe they are heading to Las Vegas soon – although whether they plan to get married there is not clear.

Star magazine says Bobbi Kristina Brown and Nick Gordon are keeping the news quiet for now – but quotes other sources expressing concern and suspicion at the time of the proposal.