Today is Hans Christian Andersen's birthday; in his honor, IBBY (International Board on Books for Young People) has organized International Children's Book Day to celebrate childhood reading and note the importance of children's books and literacy. By now we all know that Madonna has her own children's book series, but here are ten more celebrity authors you may not have known about:

1. John Travolta's book, Propeller One-Way Night Coach: a Fable for All Ages was written for Travolta's late son, Jett, just after his birth; it is being made into a movie, reportedly directed by Rob Morrow.

TO2. Terrell Owens, yes, that T.O., has a book titled Little T Learns to Share, in which a young boy struggles with being fair and sharing his new football. In the end, he decides football is no fun when played all alone.
3. Steve Martin has written a couple of very readable novellas, but I had no idea he had written a children's book. The Alphabet from A to Y with Bonus Letter Z! is a collection of alliterative couplets. From the letter A: "Amiable Amy, Alice and Andie / Ate all the anchovy sandwiches handy." That is so cute.

noelle4. Gloria Estefan has a series based on her bulldog, Noelle, in which the pet goes on "magically mysterious" adventures, available in English or Spanish. She covers themes such as fitting in, self-image, and discovering the things that really matter.
5. Tim McGraw's My Little Girl won the prestigious Mom's Choice Award® in February, chosen by a panel of judges including the founder of Reading Rainbow and creator of Baby Einstein. Not too shabby.

6. Dionne Warwick's Say a Little Prayer is a semi-autobiographical story about "Little D," who one day discovers her secret talent and is encouraged by her grandfather to embrace it. The book comes with an audio CD of Ms. Warwick singing "Jesus Loves Me."

freckles7. Julianne Moore's freckles obviously taught her a few things about feeling different and getting over it. Her heroine, Freckleface Strawberry, is the star of her own series.
8. Jamie Lee Curtis has co-authored, with Laura Cornell, eight books for children, covering every topic from empowerment (Big Words for Little People) to self-control (It's Hard to Be Five) to imagination and loss (Where do Balloons Go?).
9. Anyone with siblings can relate to Ray Romano's Raymie, Dickie and the Bean: Why I Love and Hate My Brothers. Except maybe the part where they're called Raymie, Dickie and the Bean, I mean.

10. A-Rod may be taking a cue from his, uh, friend, Madonna. His book, Out of the Ballpark, is autobiographical, telling the story of a young A-Rod who just wanted to play ball.