Joanna Krupa -- I'll Fight a Skinny White 'Housewife' ... But the Black Ones Scare Me

"Real Housewives of Miami" star Joanna Krupa wants to settle her beef with skinny white Brandi Glanville with a no-holds-barred fight -- insisting she's by far the tougher one -- but Joanna tells TMZ, she's still not tough enough to take on the black girls in Atlanta.

Krupa was out in L.A. when we asked about her possibly moving to the Bev Hills show -- and Krupa unloaded on Brandi ... promising to rearrange Brandi's face the first chance she gets.