Behind the facade of an illustrious career and relationship with former No. 1 ranked tennis player Andre Agassi, Brooke Shields was challenged and struggling. While promoting her new documentary, "Pretty Baby: Brooke Shields," the 57-year-old model and actress revealed that Agassi, whom she was married to for two years, was "petulant" after she guest-starred on the sitcom "Friends" in 1996.