Spears gives Jonas a performance to remember at London's Wembley Arena. Plus: Kim Kardashian, Beyoncé, R-Pattz and more

FANG-TASTIC DAY

Who's that fierce-looking New Yorker? It's Naomi Watts's 4-year-old Sasha, who takes a joint ride with his younger brother Kai, 2, through Tribeca on Monday.