Whitney's only child and daughter Bobbi Kristina Brown has finally tied the knot with her adopted brother despite all the criticisms from her family. After being engaged for over a year, 20 year old Bobbi Kristina, the

only child of late singer Whitney Houston, has married her adoptive brother and longtime friend, Nick Gordon. Bobbi took to twitter yesterday to announce their marriage and show off their wedding bands.

Her affair with Nick, 24, has overtime generated a lot of controversy with relatives and friends asking if her mother would have approved because Whitney cared and took Nick in as a child. So Bobbi and Nick lived like 'brother and sister' for years before Whitney's passing.

Recall when they got engaged last year, she said
"'YES, we me nick are engaged. I'm tired of hearing people say "eww your engaged to your brother" or "if Whitney was still alive would we be together or would she approve of this,"

"Everybody else doesn't have to be in my business," says Gordon, who's flanked by Bobbi at a big table. "The family has made me out to be a bad person."

"I'm in love with him," says Bobbi. "They wanna see us fail," she says to the camera. "I got one thing to say - you won't."

Photo of their rings below...