Courtney Stodden -- There IS a Sex Tape ... Gives Herself a Hand (or

Courtney Stodden's Hollywood destiny has finally been fulfilled -- she's recorded a sex tape, and it's about to go to the highest bidder.

Sources in the sex tape game told us 20-year-old Courtney recently shot her porn debut -- and it's being shopped around town. This ain't our first rodeo ... so, we figured the tape would eventually make it to the desk of Vivid Entertainment honcho Steven Hirsch, and ... bingo!

Hirsch confirms he's already seen the video, and reveals it's a solo effort (think Octomom, but hotter) -- sorry, Doug Hutchison fans. He also says the DD photo op queen "looks amazing, this is the most unique footage I've ever seen."

As for whether Vivid's bidding on the tape -- Hirsch wouldn't tip his hand.

But y'know the game by now -- Courtney has to sign off for the video to be legally distributed, and our guess is if Hirsch gets her to do that ... it's just a matter of time before there's a full release.

If there's any doubt she wants this out ... remember, this is the chick who couldn't shake out of her bikini top fast enough.