Gucci Mane dominated the NBA Kiss Cam last night at the Atlanta Hawks game -- proposing to his GF with a diamond the size of a fist ... and the crowd went wild!!!
The lucky lady is Keyshia Ka'oir -- who first met Gucci on the set of one of his music videos in 2010.
The couple was sitting courtside when the kiss cam began to roll -- and though Gucci never got down on his knee, Keyshia didn't seem to mind once she saw that rock!!
As for the Hawks, they lost 112-94 to the Pelicans .