Birthday girl Jessica Simpson  burst onto the Hollywood scene in 1999 and has been making headlines ever since. Her musical hits helped pave the way for movies and now her multimillion-dollar clothing and accessories brand, and let's not forget her high-profile relationships and her adorable children  with husband Eric Johnson. Over the years, she's dabbled in different looks, but she just keeps coming back to her blond roots  and flashing her infectious smile. Take a look at Jessica's transformation from midriff-baring pop sensation to stylish — and newly married! — mom of two when you scroll down. Happy 34th birthday, Jessica!