Is Avril Lavigne involved in a sex tape scandal?

You be the judge. The online version is here.

An extremely brief sex tape clip purporting to be Avril Lavigne, with her single 'Don't Tell Me' from last year playing in the background, has been posted to the internet.

It is mostly available via bit torrent, although we have found an mpg here. And while it could be Avril, it's probably not, there is no real way to tell.

The shot is from the back, as you can see in these screen shots above, the girl is of the same frame and build as Avril but no definitive view is available.

Update: According to various sources, this clip found originally here, is about 4-5 years old.