Madonna's Daughter Sssssmokin!! ... Lourdes Is A Big Hit In France

Yes, that's Madonna's daughter Lourdes ... and yes, that's her takin' a drag off something that doesn't seem very tobacco-ish.

The bikini-clad 17-year-old is vacationing in the South of France this week -- sans parents, at least as far as we can see -- and partaking in a little puff puff with friends in between jumps in the Mediterranean.

They must be having a pretty good time, cause that cig's getting smaller and smaller.