Simpson and Wentz create a water world for two while vacationing in Jamaica. Plus: Sarah Jessica Parker, Paris Hilton and more

SUITED UP

Neil Patrick Harris takes in the scene while celebrating the spring premiere of his show How I Met Your Mother Thursday at the Palihouse Holloway, a West Hollywood hotel. The sitcom welcomes a big guest star in an upcoming episode: Britney Spears. "She has a good sense of comedy," Harris told PEOPLE about working with the pop star.