If celebrity nuptials, as with deaths and other stuff, come in groups of three, whose imminent divorce lurks in the wings after the implosions of the marriages of Kate Hudson and Reese Witherspoon? Shouldn't there soon be another A-list leading lady flushing her husband to the curb? If push comes to shove, can we get Scarlett Johansson and Josh Hartnett to wed and then turn around and end things by year's end? And please don't mention Jessica Simpson. She's not a headliner. Nor an actress.