The Very Last Scene (SPOILER obviously)

Rating: Null/10 (22 January 2006)

When the alien bursts out of the dead Predator's chest right at the end of the movie, we can see it has the same cheek features of a Predator. Its cheeks open up just like the Predator. Wonder what that was all about.
In the original "Alien" they theorize that the Aliens adapt to the host's living conditions. By being cocooned in the Predator, the Alien might have picked up his facial features. That is the only plausible reason I can think of. Besides the "genetically mutated alien" conspiracy theory, why does the Alien look like a Predator? Does anyone have the facts on this??