JENNIFER NETTLES usually shows solidarity with KRISTIAN BUSH when people ask if she's going to put SUGARLAND out of its misery and go solo. But this time she actually left the door open for each of them to go their separate ways. She said, quote, "Kristian and I are very supportive of each other in that way. He's been off and writing with everybody on the planet, and I don't have anything on the books right now as far as scheduled to go in, "But I hope to be able to do that one day. And we both do actually, so we'll see."