Prince Is KingThe lion has risen again. Chronicles of Narnia sequel Prince Caspian dethroned two-week champ Iron Man by debuting with a $56.6 million box office weekend. Though the news isn't all good for the moptop. The premiere was actually below the numbers that had been predicted, while Iron Man, though falling out of the top spot, still raked in a hefty $31.2 million, bringing its total to $222.5 million and almost ensuring that star Robert Downey Jr. and director Jon Favreau will see a hefty pay increase for Iron Man 2. As for the rest of the top five: The Ashton Kutcher and Cameron Diaz comedy What Happens in Vegas dropped from second to third place with $13.9 million ($40.3 million for two weeks); the live-action Speed Racer continued to disappoint, falling from third to fourth with $7.7 million ($24.4 million for two weeks); and the Tina Fey and Amy Poehler comedy Baby Mama held on to fifth place with $4.6 million, taking its four-week total to $47.3 million