Farrah Abraham -- The Truth Comes Out ... Of Her Bikini

Bogus sex tape peddler Farrah Abraham just can't hide it anymore ... her breasts that is.

Abraham went frolicking on an L.A. beach earlier today in a barely-there bikini, where she celebrated the imminent release of her totally-staged "sex tape" with porn star James Deen.

TMZ broke the story ... Deen blew the lid off Farrah's sex tape plot yesterday ... telling us he was approached by a porn company to stage the sex tape over the weekend ... and that Farrah was behind the whole thing.

And we're not complaining ... at all.