by Breaking Celebrity News Staff

Rihanna, who?

Chris Brown gave one lucky fan a memorable night when he had her sit in a chair on stage while he dirty danced -- even giving her a mini- lap dance!

Brown was shirtless through most of his steamy performance in Miami, which was part of the 'Best Of The Best' Spring Fest concert in Bicentennial Park.

He briefly straddled the woman, slithered against her and then kissed her in front of thousands in the audience -- all while singing Take You Down.