Heretofore known for his viciously incisive, very black socio-sexual satires, director Neil LaBute takes a joyride in antic comedy territory with "Nurse Betty." It's charming effort of pure entertainment about a gentle, bouncy Kansas waitress who becomes convinced she's a part of her favorite soap opera after being sent into post-traumatic shock by witnessing a murder.

The murder was that of her abusive, redneck husband (LaBute regular Aaron Eckhart in another amazing chameleon performance) -- a retribution for a shady business deal gone wrong.

The waitress, Betty Sizemore, is the kind of bona fide wide-eyed innocent most Hollywood actresses wouldn't be able to play without slipping into a hammy, ignorant hayseed routine and winking ironically at the audience. But in the hands of Renée Zellweger -- who proved her sweetheart credibility in "Jerry Maguire" -- Betty is 100 percent genuine sugar.

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