Matt Damon looked a bit worse for the wear yesterday on the Mexico City set of Elysium. The actor's still modeling a shaved head, but we can see Matt's full mane in his upcoming We Bought a Zoo. Fox Studios screened sneak peek showings of We Bought a Zoo over the Thanksgiving holiday to gain buzz prior to its Dec. 23 release. Matt's work south of the border may come to a halt soon so he can return to the States for Zoo's Dec. 12 Manhattan premiere. Hopefully his costar Scarlett Johansson will also be able to take a break from filming Under the Skin in Scotland to join in on the NYC fun.