Pippi Longstocking -- Sex Tape Will NEVER See the Light of Day

Tami Erin -- the actress who played Pippi Longstocking in the 1988 movie -- insists she had nothing to do with her sex tape being shopped around town ... in fact, she tells TMZ Live, she'll stop at nothing to make sure it NEVER gets released.

39-year-old Erin called in moments ago and she was irate -- blaming a bitter ex-boyfriend for attempting to sell a private hardcore sex tape to the media.

She said, "I think he's the biggest piece of sh*t on the planet for doing this to me."

As for any sex tape deal, Erin says she has not been approached about selling the tape, which is good ... because in order for a company to release this kind of footage, it would need Erin's permission.

She sounds really angry ... and we're not calling BS ... but we do want to point out that Erin's not exactly averse to public displays of sexuality, posting photos like these on Twitter over the last couple months. Nice bod.