The reunited twosome take a break from motorcycling through Malibu. Plus: Gwen & Zuma, Rihanna, Jake Gyllenhaal and more

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Gwen Stefani keeps 5-month-old son Zuma snuggled in a sling as her little guy checks out the action while arriving Thursday in London with husband Gavin Rossdale and 2-year-old son Kingston (not pictured).