<div><p>LOS ANGELES (Reuters) - It had to happen sometime, but nobody expected the biggest film of all time to lose its North American box office crown this weekend to "Dear John," a low-budget "chick flick" with a pair of little-known stars.</p>&lt ...

<div id="subtitle">Box-office performance for 10 best-picture Oscar contenders including `Avatar,' `Hurt Locker'</div><div><p>North American box-office performance as of Sunday for Oscar best-picture nominees:</p><p>_ "Avatar," 20th Century Fox, nine nominations, $596 ...