The elliptical machine was so yesterday! McConaughey skips to jump rope in Malibu. Plus: Britney Spears, Kate Hudson and more

WHO'S THAT GIRL

It's flashback '80s for Geri Halliwell as she heads to her London hotel on Thursday wearing a Material Girl-inspired look. While she's at it, Halliwell is also channeling Madonna's career move: The former Spice Girl is penning a series of children's books.