Alien vs. Predator scared up some serious coin at the weekend box office, debuting at No. 1 with a monstrous $38.3 million. Princess Diaries 2: Royal Engagement finished a strong No. 2 with $23 million, bringing its five-day total to $37.2 million. Tom Cruise's Collateral slipped to third with $16 million, followed by Yu-Gi-Oh! The Movie (No. 4 with $9.4 million) and The Bourne Supremacy (No. 5 with $8.3 million).