Brooke Shields is offering an update on the femur she shattered just over a year ago, though one glance at her bright smile tells the story.The 56-year-old actress spoke to ET's Matt Cohen at the San Diego Zoo, where she soaked in the festivities after the park — where she once interned — opened its 3.2-acre wildlife basecamp exhibit. That she was able enjoy the park's expansive grounds, not to mention the rope bridge, is quite the accomplishment considering it was a little over a year ago when Shields shattered her femur in a freak accident that had her wondering if she'd ever be able to walk again.Shields attributes moving so well to her determination and hard work at rehab.«It's just, you have to fight,» she says.