Many pregnant moms wonder what to expect when become new mothers.

"What to Expect When You're Expecting" by Heidi Murkoff and Sharon Mazel might be an old book, but its contents are still relevant today, including for celebrity mothers-to-be.

The fourth edition, published in April 2008 by Workman Publishing Company, is a still a New York Times Bestseller listing #4 on the Paperback Advice & Misc. list. It has been there for 575 weeks.

The book is described:

Announcing a brand new, cover-to-cover revision of America's pregnancy bible. What to Expect When You're Expecting is a perennial New York Times bestseller and one of USA Today's 25 most influential books of the past 25 years. It's read by more than 90% of pregnant women who read a pregnancy book--the most iconic, must-have book for parents-to-be, with over 14.5 million copies in print.

Now comes the Fourth Edition, a new book for a new generation of expectant moms--featuring a new look, a fresh perspective, and a friendlier-than-ever voice. It's filled with the most up-to-date information reflecting not only what's new in pregnancy, but what's relevant to pregnant women. Heidi Murkoff has rewritten every section of the book, answering dozens of new questions and including loads of new asked-for material, such as a detailed week-by-week fetal development section in each of the monthly chapters, an expanded chapter on pre-conception, and a brand new one on carrying multiples. More comprehensive, reassuring, and empathetic than ever, the Fourth Edition incorporates the most recent developments in obstetrics and addresses the most current lifestyle trends (from tattooing and belly piercing to Botox and aromatherapy). There's more than ever on pregnancy matters practical (including an expanded section on workplace concerns), physical (with more symptoms, more solutions), emotional (more advice on riding the mood roller coaster), nutritional (from low-carb to vegan, from junk food-dependent to caffeine-addicted), and sexual (what's hot and what's not in pregnant lovemaking), as well as much more support for that very important partner in parenting, the dad-to-be.

Overflowing with tips, helpful hints, and humor (a pregnant woman's best friend), this new edition is more accessible and easier to use than ever before. It's everything parents-to-be have come to expect from What to Expect... only better.

Some celebrity mothers might see reading this book to be helpful.

According to Today Entertainment, Actress Anna Paquin was spotted out flaunting her baby bump in L.A. on Monday. She is rumored to be having twins, and was wearing a bright yellow sundress while going to lunch. She stars in the hi series "True Blood."

Drew Barrymore is also expecting. She was spotted in L.A. on Monday in some workout clothes when she worked up a sweat at a prenatal yoga class.

Camila Alves, wife to Matthew McConaughey, recently announced she was pregnany in July. She showed off her baby bump Sunday in New York City in a navy blue mini dress while taking a walk with McConaughey and children Levi and Vida.

Vanessa and Nick Lachey are also expecting their first child, a boy, and he is coming "at any minute," according to CelebrityBabyScoop. She told the website she is in her third trimester and "has been more of an emotional and mental training time" and "anxious." Hang in there Vanessa!

Some stars recently gave birth. "Jersey Shore" star Snooki welcomed baby boy Lorenzo on Sunday with fiancé Jonni LaValle.

"Scary Movie" actress Anna Faris welcomed a beautiful baby boy named Jack in June with husband Chris Pratt. Kourney Kardashian welcomed baby Penelope with boyfriend Scott Disick in July.

Have you read or do you know anyone who read this book? Does it help? Share your thoughts below!