this is actually fairly common from what i see, but those pics are particularly good. usually i see it happening on "white" strains or crosses thereof. not a lot of info on it on the net, just some threads like this one. it's definately not a bad thing. cloud nine wouldn't happen to have some white lineage would it?
edit: i just looked up the strain and it doesn't appear to have white lineage (i didn't go back vey far), but i did notice a lot of dinafem gear does have white lineage...who knows? either way nice plant.