Someone else will have to play feminist hero Gloria Steinem in Lovelace — because Demi Moore won't be joining the cast of the porn biopic after all.

Now seeking help for exhaustion, the newly single 49-year-old actress has pulled out of the highly anticipated film about porn star Linda Lovelace starring Amanda Seyfried in the title role, her rep confirmed to Deadline.

Moore, who weathered a painful split from husband Ashton Kutcher late last year, was rushed to the hospital late Monday night for an "unknown illness," according to an L.A. Fire Department spokesperson. Her publicist later confirmed that Moore is getting professional help.

"Because of the stresses in her life right now, Demi has chosen to seek professional assistance to treat her exhaustion and improve her overall health. She looks forward to getting well and is grateful for the support of her family and friends."

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Indeed, the mother of three has appeared alarmingly thin as her 33-year-husband's torrid September fling with Sara Leal came to light.

Two weekends ago, she took daughter Rumer Willis as her date at the Cinema for Peace/Help Haiti Home benefit at the Montage in Beverly Hills — beaming, but thin, in a black cocktail dress.

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