It’s ET’s “Fresh Prince” takeover! Only we were with Tatyana Ali as she guest co-hosts ET. What you didn’t see in the reunion special. We’re with the cast for a behind the scenes look. And, what it took to pull off that “Aunt Viv” reunion. Then, another tragic loss for Bobby Brown. We have the latest details on his son’s death. Plus, how long will “McDreamy” stick around on “Grey’s Anatomy?” His co-star gives us some inside details.