Oksana Grigorieva has an opportunity to get something off her chest -- her shirt -- because TMZ has learned Playboy Magazine has officially made an offer for a "full nude" spread.



Sources close to the offer tell us Playboy is willing to fork over a cool $75,000 for her trouble -- and to sweeten the deal, they're even willing to give Oksana the cover ... a pretty enticing move for a struggling musician looking for some non-Mel publicity.

So far, no word on whether Oksana is considering the move -- but with her significant legal debt, it could be the perfect opportunity.