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Alec Baldwin will join Cameron Diaz, Dakota Fanning and Elle Fanning in "My Sister's Keeper," the Nick Cassavetes-directed adaptation of the Jodi Picoult novel for New Line.

Mark Johnson is producing. Jeremy Leven wrote the script; production begins in February.

Baldwin will play the attorney who represents a child (Elle Fanning) after she sues her parents for emancipation on the grounds they bred her to be a genetic match who could prolong the life of her cancer-ridden sister (Dakota Fanning). The girl's mother (Diaz) is a former trial lawyer and represents herself in court.

While his NBC series "30 Rock" halted shooting because of the writers strike, Baldwin had a contractual right to schedule a movie anyway. He will also voice a character in "Madagascar 2."