The singer returns to work in L.A. Plus: Lindsay Lohan, Destiny's Child, Penelope Cruz and more

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GIRLS JUST WANNA HAVE FUN

Talk about a paparazzi's dream: Paris Hilton and Pam Anderson (accompanied by their pal, celebrity photographer David LaChapelle) stroll hand-in-hand after a shopping trip to Malibu boutique Planet Blue on Sunday.