Am I too fat? Why aren't I popular? Why doesn't that boy like me? If you're a young girl or teenager (or know of one) who's struggling with poor self esteem or body image, here's a simple piece of advice -- Ask Elizabeth.

PHOTOS: Elizabeth Berkley Through The Years ( LINK)

Actress Elizabeth Berkley -- who first shot to stardom as the beautiful and brainy Jessie Spano on TV's Saved By The Bell -- is on crusade to help young girls feel confident and secure in who they are.

Berkley -- who, in addition to TV has also appeared on Broadway and in several films including The First Wives Club and Curse Of The Jaded Scorpion -- has written a new book, Ask Elizabeth, based on her series of self-empowerment workshops around the country aimed at girls aged 11-17, which she launched in 2006.

The book is a scrap-book style compliation of girls' personal stories, thoughts from Berkley, and advice from experts.