Spencer Pratt knows "for 100% fact" that a Lauren Conrad/Jason Wahler sex tape existed. One hundred. Fucking. Percent. Fact. Not 10% fact like reasons to invade a country. Not 50% fact like a Barack Obama campaign speech. Not even 75% fact like goings on at a Duke lacrosse party. We're talking 100%. And he'll take a lie detector to prove it. Oh yeah? [Us]