ET was on the red carpet with Cameron Diaz and her co-stars for the premiere of their new movie, 'My Sister's Keeper,' in New York on Wednesday night!

"What I'm so proud about this film is that it's a film that everyone can relate to," Cameron tells ET, adding that the bittersweet emotional drama is, in part, about "all the things that we fall in love with [and] all the things that break our hearts."

Click the video for more from Cameron and her co-stars, including Abigail Breslin, Sofia Vassilieva, Jason Patric, and Thomas Dekker.

In theaters Friday, 'My Sister's Keeper' stars Cameron as Sara, a mother who is devastated when her precious toddler daughter Kate (Sofia) comes down with a rare form of leukemia. Sara and her husband Brian (Jason Patric) conceive another child out of desperation, a daughter named Anna (Abigail), who is a perfect genetic match and will be able to save her sister's life. But the family's world is turned upside down when Anna decides, at age 11, to seek emancipation to avoid being forced to give her sister a kidney.

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