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Talk about a big little rivalry!

What started out as a mutual love of literature has turned into an all-out competition between co-stars Nicole Kidman and Reese Witherspoon as the former besties race to option the hottest new books on the shelves.

Nicole loves a good page-turner and so does rival Reese!

Last month, Nicole, 52, announced her third book-to-TV project, and friends say Reese isn’t happy about it since it was her idea in the first place. Ever since she officially turned her book club Hello Sunshine into a production company in 2016, the 44-year-old Legally Blonde star has acquired dozens of stories. “When Big Little Lies took off, Reese became a serious producer in Hollywood,” says a friend. “She’s become an unofficial leader in telling women’s stories and now everyone from Nicole to Jen [Aniston] are all trying to do the same thing. “But of all the women, it’s Nicole she’s most worried about. She doesn’t want a bidding war over a book to come between their lucrative working relationship. But given the nature of the business, it isn’t out of the question.”