Credit: Michael Kovac/FilmMagic

Tori Spelling's kids have something to get excited about: She's writing her first children's book!

The 36-year-old star, who is already a best-selling author with sTORI Telling and Mommywood, has signed on with publisher Simon & Schuster to pen the kids' book, which is called Presenting ... Tallulah.

The book -- a "sweet tale of a young girl who really just wants to be herself" and is tired of constantly being told what to do -- will go on sale on Sept. 21, the publisher announced Tuesday.

Spelling -- who is mom to Liam, 2, and Stella, 1, with hubby Dylan McDermott -- already counts them as fans.

"I love reading to my kids," she has said. "It's our special time together."

Her third adult release, tentatively titled uncharted terriTORI, is scheduled to hit bookshelves in June.