Keira and Sienna got giggly on the set of The Best Time of Our Lives in North Wales this week. Since Sienna's already been spotted in NYC, we have a feeling Keira will be leaving the UK as well - to grace a lot of red carpets with her hot Pirates co-stars. Pirates of The Caribbean: At World's End hits the theaters on May 25th, and while the hype hasn't been quite up to Spider-man level, we're willing to bet that the franchise will give Spidey a run for its money. But don't take our word for it - check out lots of new clips and photos of the movie and see for yourself.