EXCLUSIVE

Call her Pippi Schlongstocking ... 'cause the actress who played the famous firecrotch in the 1988 movie is now starring in a hardcore sex tape being shopped around town, TMZ has learned. Call her Pippi Schlongstocking ... 'cause the actress who played the famous firecrotch in the 1988 movie is now starring in a hardcore sex tape being shopped around town, TMZ has learned.

The "star" of the tape is 39-year-old Tami Erin -- who played the freckle-faced red head girl in "The New Adventures of Pippi Longstocking" back in 1988 ... when she was 14.

We've seen the X-rated footage ... which appears to have been shot very recently and features Tami in various sexual situations -- most of which involve an unidentified penis.

And no, she's not wearing pigtails in the video ... you sick freaks.

So far, it's unclear if anyone has purchased the tape -- but we're guessing Steve Hirsch's ears just perked up.