And indeed, we get some version of a pony right off the bat. This was, I believe, before she discovered hot pants, so she was still trotting around looking like a 14-year old girl in search of a ninth-grade dance.
Pony 1, Down 0.

HARK! She dared wear it down. Pony 1, Down 1.
I guess she's a go-go dancer now. Pony 2, Down 1.
This is one of those where I can't ever tell WHAT it is, because it LOOKS like a half-pony, but then she'll turn around and you see it's all scraped up high and right back there and her prodigious extensions are just spilling all over her shoulders. Regardless: Pony 3, Down 1.

Pony 4, Down 1, That Bodice -65.
Pony 5, Down 1, The Memory Of Madonna's Blonde Ambition Tour 100 (because she did it better).
Pony 5, Down 2, Whatever Shelf Is Back There, A+.
Pony 6, Down 2. Seriously, how much DOES her hair weigh?
A definite half-pony or at least, a half-updo. Shoot, do I have to make that its own category? Not Down, Not Quite A Pony? Sigh. Pony 6, Down 2, NDNQAP 1.
Much easier. Pony 7, Down 2, NDNQAP 1.
Pony 8, Down 2, NDNQAP 1, and also, I have NO IDEA why kitty ears are her thing but it's super creepy to me.
Pony 9, Down 2, NDNQAP 1.
Pony 9, Down 2, NDNQAP 1.
Thank you. We were getting REALLY lopsided here. Pony 9, Down 3, NDNQAP 1.

.... Executive decision: I think it's at LEAST a half-pony back there. Pony 10, Down 3, NDNQAP 1.
Yep, I'm calling it a half-pony. Pony 11, Down 3, NDNQAP 1.
I just wanted to look at this again. it's AMAZING. Full marks to her for tweeting "#bangbangintomyface" as a joke, because that's funny, but I'd bet money her brother Frankie (whom I know from Big Brother) thought of it.

She even brought the same-old-same-old on Marie Claire. Pony 12, Down 3, NDNQAP 1.
And that's our running total: In a sampling, I basically found the only three times she wore her hair down, and got a random array of other times she wore it up, so the actual ratio is probably bigger than three-out-of-every-four. Ariana, it's time to branch out. Find a pair of scissors and go to town.