I hate to burst everyone's bubble, but I doubt that's Luna unless her mom created the page.
It looks a LOT like PinkRock's -who happens to be Luna's mom's- page (to the point that it's either her, her helping very much with the writing, or a very, very fucking skilled troll, and my money's on the latter because some things here are pinging my trolldar like mad - the fake age, the admission to underage drinking which could get her father caught up in scandal, the profession of her religion as Christian when neither Sugizo nor PinkRock adhere to such a belief system and her still being likely young enough to be influenced by them...)
Unless Gretchen herself said this WAS Luna, I'm calling troll.... and if it's not a troll, most of us shouldn't be adding Luna yet. Unlike some other kids *coughRIKUcough* she's not active as an artist and therefore she is None Of Our Business.... IMO of course.