Charlie Sheen's Ex-Goddess -- It's PLAYBOY Time

"Charlie Sheen's former goddess Bree Olson dolled herself up yesterday for a classy nude photo shoot for Playboy  ... TMZ has learned. Moments before the shoot, Bree tweeted the above picture with the caption "So EXCITED!!!"

Bree -- who dumped Charlie Sheen last month via text message -- reportedly swore off the adult industry after she started dating the Warlock ... but now that the relationship is over ... it appears she's easing up on her no-adult policy.

So far, no word on when the spread is set to hit the shelves."(TMZ)