Bobby Brown and Bobbi Kristina Reunite

Bobby Brown and his daughter Bobbi Kristina took a huge hit from the peace pipe this weekend -- and had an emotional reunion on Father's Day.

Here's what we know ... BK posted 2 pics of herself and Bobby in a full embrace -- she even says, "I got a running start" to jump into his arms for the hug.

Bobbi Kristina was grinning from ear-to-ear and added ... "My face says it all. I love you daddy."

Pretty amazing ... they've been estranged since Whitney Houston's death 2 1/2 years ago.