Kusumi Koharu, 7th generation "ace" and soloist under the name "Tsukushima Kirari starring Kusumi Koharu (Morning Musume)"
Some of her pics:

Promoting "Chance!"
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Promoting "Morning Musume ALL SINGLES COMPLETE ~10TH ANNIVERSARY~"
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Promoting "Bon Kyu! Bon Kyu! BOMB GIRL" (Morning Musume Autumn Tour 2007)
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So cute... at the same time beautiful... at the same time sexy... heart