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

SKIN IS IN

Kate Hudson shows some skin in a sexy Rachel Roy dress Thursday as she arrives for Cartier's 100th Anniversary in America celebration at the Cartier Mansion in New York City. For a touch of sparkle, Hudson sported the jewelry line's onyx and diamond panther necklace to the party.