This could be an even bigger event than a Paris, Screech and Collin Farrell sex tape all put together! There seems to be a sex tape with Scarlett Johansson out there, in which the starlet makes out with an unidentified man (other than Josh Hartnett) in a car, on the set of one of her movies!

Sure, at this point, this is just a rumor that circulates on the Internet, but a certain site (click HERE to see it) claims that the audio and partial video tape is in their possession and anyone can get their hands on it for the meager sum of 20 bucks.

However, do not rush to buy it, as the site doesn't say for a fact that it is Scarlett the one who gets hanky-panky, it's only a speculation at this moment. The story goes as such: the actress (presumably Johansson) was on set, after many hours of hard work and, at one point, she goes with this dude in a car to make out.

Unaware that she still has her microphone on, the alleged Scarlett gets touchy-feely with the man, there's a lot of kissing and sweet talk, and the lovers' encounter ends with a... not a good-bye kiss, but a blow job, according to the cited site.

Here's an excerpt from the 'ad' for the tape, namely, the words of the operator who realized what he came across and taped the entire thing: 'there is some more sweet talk, then some more rustling, then they start kissing and so forth. THEN, for twelve minutes and forty seven seconds, she gives him the sexiest blow job I have ever heard capped off by the words "Yeah, c*m."'.

So, if your curiosity always gets the best of you, go and buy that tape. But, if not, just be patient until the first buyer makes a down payment and then we'll all know if that's Scarlett on that tape or not. Stay tuned here for more information.