Is Bobbi Kristina Brown Engaged to Adopted Brother?

Is Bobby Christina, 19, engaged to Whitney Houston's 22-year-old adopted son Nick Gordon? Her rep says no, but a video appears to tell a different story.

Bobbi will appear in a new Lifetime reality series with her family set to premiere on Oct. 24.

The show, "The Houstons: On Our Own," released a sneak peek in which Bobbi makes the shocking announcement to her family.

Bobbi nervously giggled as she said, "We're engaged" to disapproving family members in footage from the new reality show which was obtained by E! Online.

According to Bobbi's aunt pat Houston, the engagement is unacceptable and the relationship between her niece and Gordon is "a very, very strong friendship.'

'A lot of teenagers, when they hit 18, they think they're grown," Houston told ABCNews.com. "They think they know it all, they think they know about relationships. You just to have to be there to navigate and guide them."

Bobbi was seen sporting a quite massive diamond ring on her left ring finger on Thursday night when he and her alleged fiancé attended a Grammy tribute to her late mother.

A rep for Bobbi Kristina tells CNN that the two aren't engaged, but adds, ""You have to watch the show!!