It's garbage just like the link you posted to the so-called Megan Fox sex tape in her thread (which will soon be deleted).
I don't even have to click the link to tell you with near 100% certainty that it is NOT her. If there was even an ounce of legitimacy to it, it would already be announced and posted on most every celeb site on the net, TMZ, etc. with her representatives vehemently denying (or quietly confirming) that it is her.
Sites trying to pawn off look-a-likes as the real deal are a dime-a-dozen. They're just dumbasses looking to make a quick buck by preying on the desires & ignorance of others.