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

HOLDING PATTERN

After spending Wednesday with mom Ashlee Simpson-Wentz, 1-year-old Bronx assumes a favorite position – on his daddy Pete Wentz's back! – during an afternoon stroll Thursday in New York.