This commercial for Serena Williams's butt was never meant to see the light of day. Oh, sorry, actually it's for a tennis video game called Top Spin 4—my mistake. The company behind the ad, 2K Sports, decided not to air it. But then, apparently unhappy with that decision, the other actress in the ad posted it herself on YouTube, according to Joystiq. "This video is not part of the title's final marketing campaign and its distribution was unauthorized," 2K Sports says. Hopefully the approved finished product will show the actual game somewhere in there.