Actually, Kringas, it's in a film, not in an AP story, so it's correct.

And, if the AP ever writes about "Bridget Jones's Diary," it has to write it that way, because it's part of a title (even though my Firefox spellcheck is now scolding me for having written "Jones's"). It's kind of like theater/theatre: AP style is to always use theater, unless it's part of a proper name that uses theatre.
The New York Times, which has it's own style, actually used to be (and may still be) much more convoluted when it comes to the singular proper noun ending in s rule. The basic is to use s' or s's depending on how it's pronounced. So, if you say "Bridget Jones-es Diary" or "Phyllis-es post," you'd use s's. For others, like, "The Golden Girls scriptwriters," you don't say "Golden Girls-es," so you'd just use s'. And then there's a bunch of other exceptions, like if there are preceding syllables with an "s" sound, like Kansas' laws or Arkansas' cities.
I read recently that the apostrophe might just disappear from the written word eventually anyways. Er, anyway.