Perry cozies up to her ex during a day at the beach in Miami. Plus: Gwen Stefani, Kate Hudson, Winona Ryder and more

GUEST OF HONOR

It's party time! A colorfully dressed Lily Allen keeps her chin up Thursday at a 100th birthday bash for London department store Selfridges. The singer recently toured the U.S. behind her It's Not Me, It's You album and is now performing across Europe.