WHITNEY HOUSTON'S DAUGHTER BOBBY Kristina KISSING with 'Adopted' Brother

Whitney Houston's daughter engaged in some PDA -- including a kiss -- with her secret BF yesterday ... a guy who happens to be her pseudo-adopted brother
19-year-old Bobbi Kristina was seen in a full-on lip-lock with 22-year-old Nick Gordon during a lunch run in Atlanta Tuesday ... confirming suspicions the two are romantically involved.


PHOTOS:

Bobbi Kristina and Nick Gordon



Bobbi Kristina and Nick Gordon



Bobbi Kristina and Nick Gordon



Bobbi Kristina and Nick Gordon



Bobbi Kristina and Nick Gordon