This is model Linda Le (also known as "Vampy Bit Me") who is a regular on the cosplay scene, as well as being a professional model. She's returned from a brief hiatus with style, modeling Spider-man's love interest, Black Cat, and she looks amazing!
The Black Cat is an antiheroine who first appeared in Marvel's The Amazing Spiderman back in 1972. She is the alter ego of Felicia Hardy, who we recently saw a glimpse of in Amazing Spiderman 2 (played by Felicity Jones).
It'll be interesting to see how the character develops in further installments, but one thing's for sure, Peter Parker will be keen to see her hanging around more often...
Source: Comic Book Movie