The streaker is suspected to be model Kinsey Wolanski, who's dating Vitaly Zdorovetskiy -- a guy who set up a Russian porn site that the two of 'em must really be passionate about ... 'cause she ran out onto the pitch in the first half in a skimpy one-piece with his site plastered in front.
Security was quick to give her a chase and escort her off the field, but not before everyone got a glimpse of her body-hugging outfit and some revealing shots ... from the front and back.
Gotta say as far as in-game interruptions go .