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Julie Andrews is feeling practically perfect in every way. After all, the Mary Poppins star—who had her 90th birthday on Oct. 1—is celebrating the start of the new decade by continuing one of her favorite activities: publishing books with her daughter Emma Walton Hamilton, whom she shares with ex-husband Tony Walton. The mother and daughter duo recently reissued their 2010 book The Great American Mousical about a troupe of theater-loving mice, this time illustrated by Tony, himself a famed costume and production designer. As Julie told People in an interview published Oct. 27, she and Emma “just had such a ball writing it.” For the Sound of Music actress—who has written 30 books with Emma, 62, over the past 25 years— getting to work with her daughter has helped them become even closer, noting that the two often finish “each other’s sentences.” She also confessed that Emma handles all of the computer work, joking, “Bless her heart, she does [the typing] for me. Otherwise, we'd be here on the first book still.”