Teaser for Captain America #600
Spoilers, of course.
Yes, that's Femme!Bucky from the Heroes Reborn titles. She was transported to Earth 616 at the end of Onslaught Reborn (which I've been meaning to post for a while, but you know. LIEFELD and LOEB.)
If there's interest in me posting stuff from that series I will.
Edit: I forgot the source! IO9 is where I saw this posted. Sorry!