Danbooru-based image board with a specialization in high-quality images.
akiyama_mio animal_ears ass bunny_ears bunny_girl erect_nipples k-on! nakaba_reimei tail

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It definitely does look like her, but without a note from the artist saying that it is or isn't her, it's not like we could know for sure either way. Lots of folks in anime and manga characters look alike.

EDIT: Actually, looking at the source page, according to google's translation tool, the image is labeled Mio Rabbit, so it looks like it is Mio.
yep, one of the pixiv tag is 秋山澪 tag, so yea.. she's Akiyama Mio <3