Photo flashback: Jessica Simpson's life and career in pictures, Gallery

Celebrate Jessica Simpson's 40th birthday by taking a look back and her life and career in pictures!

Jessica Simpson on Taking Risks and 'Knowing Her Worth' After

Jessica Simpson Starts Over

Mega flashback gallery: Townsville's Cup Day celebrations

Photo flashback: Jessica Simpson's life and career in pictures

Flashback! 18-Year-Old Ashlee Simpson Teases Jessica Simpson About

Jessica Simpson on MTV TRL: A Nostalgic Flashback

Jessica Simpson In The Press Room For The 32Nd Annual People'S Choice Awards, The Shrine Auditorium, Los Angeles, Ca, January 10, Photo By, Jessica Simpson 2006

Jessica Simpson In The Press Room For The 32Nd Annual People'S Choice Awards, The Shrine Auditorium, Los Angeles, Ca, January 10, Photo By, Jessica Simpson 2006

Jessica Simpson fans stunned at her mother Tina Simpson's age

Jessica Simpson, 43, shares 'unrecognizable' photo taken six years

Dear Jessica Simpson

Photos: Jessica Simpson through the years

Photo flashback: Jessica Simpson's life and career in pictures