It's Tetsuko as Star Trek's Yeoman Janice Rand again, this time as she might have appeared in the second season episode "Mirror, Mirror". I just know that if Rand's character had continued into the second season, she'd be the "Captain's Woman"!
TCC March 2011 - B 16:9 by *dcmatthews on deviantART
TCC March 2011 - B 4:3 by *dcmatthews on deviantART
Oh, and if you don't remember what Tetsuko looked like as Rand the first time, here it is again:
Tetsuko as "Yeoman Rand" by *dcmatthews on deviantART