After accidentally tweeting a topless picture of Melissa George to the world, Russell Simmons probably feels a little protective of his lady. That's probably why he aggressively grabbed her ass in front of the paparazzi, as if to say, "This is my ass right here."
On the one hand, we respect Russell Simmons and were we in charge of paparazzi, we would have some of the cameras back down. On the other hand, if Rus is going to mark his territory in public like this, we might just have cameras on him at all times.