I don't think such a video has ever been generally known to exist on the Internet. Doesn't mean that she doesn't have a sex video somewhere, I've just never seen one. If you follow some of the other discussions, someone says it is on Xvideos. Doing a search of "Christina Model" pulls up some of her site videos, but also other videos labelled with Christina Model. One video, which is clearly not Christina, has a girl who holds a mild resemblance to a very tan, and hair with bleach streaks, Christina. Her tits aren't the right shape or size and she has a tattoo on her right shoulder. Clearly not Christina. However, I pulled some of the footage, blurred it a little, and if you squint, this GIF might make you think it is Christina wannabe: