Efron cozies up to a pet pooch in Aspen, Colo. Plus: Britney Spears, Mariah Carey, Heidi Klum and more

FESTIVE FAMILY

Ever the fashionista, Gwen Stefani makes sure her boys Zuma, 1, and Kingston, 3, are seasonally styled during a sweet family outing with Gavin Rossdale (not pictured) in London Friday.