Amanda Fuller will play the actress who starred in Clueless, Girl, Interrupted, Don't Say a Word, 8 Mile, Sin City and Happy Feet before tragically dying of pneumonia in 2009 at the age of 32.
"Quickly landing a breakout role in the '90s hit Clueless, the 17-year-old continued her rapid climb to fame, working with some of Hollywood's biggest stars in such high-profile hits as Girl, Interrupted, Don't Say a Word and 8 Mile, among others," Lifetime said in a synopsis.
"With a personal life equally as glamorous, Brittany dated leading men like Ashton Kutcher before settling down to marry British screenwriter Simon Monjack. But relentless rumors, media glare and merciless pursuit by paparazzi -- coupled with insecurities about her appearance and an underlying desperation for approval -- wreaked havoc and took an enormous toll on Brittany's fragile psyche.
Through it all, Sharon remained her grounding force, but found too late that a mother's enduring love wasn't enough to save her from the dark side of life in Hollywood -- and the world was shocked by Brittany's abrupt and mysterious death at just 32 years of age ... followed five months later by that of her widowed husband."