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Elizabeth Berkley has come a long way since her Showgirls days ... the actress-turned-author is now at the top of the New York Times Best Sellers list with, Ask Elizabeth: Real Answers to Everything You Secretly Wanted To Ask About Love, Friends, Your Body ... and Life in General..

The actress spent part of her afternoon on Thursday having lunch with a male friend, but appeared very attentive and focused. Could Berkley possibly already be working on a follow-up to her self-help book?

In Ask Elizabeth, the 39-year-old offers insights and encouragement to teen girls. The popular inspirational book's design was a collaboration between Berkley and her husband, Greg Lauren, Ralph Lauren's nephew.

With her many years of experience in the cut throat, superficial entertainment biz, it's good to see Berkley putting those lessons to good use ... just as long as she is not offering teen girls stripping advice.

A pregnant celebrity was recently caught with her self-help book. Find out who it is ... after the jump!