Toronto: Jennifer Aniston on Feeling Free to Fall Apart in 'Cake'

Courtesy of Toronto International Film Festival

"We don't always have our heels on and our makeup on," the actress told a festival press conference

Jennifer Aniston says she has found physical and emotional freedom living in a Percocet-fueled hell in Daniel Barnz's Cake.

"I loved every minute of it. It was extremely liberating to do that. I loved it, because as women, we do feel we have to live up to an expectation, whether on camera or just going to the market," Aniston said at the Toronto press conference for Cake, which debuted to a standing ovation at the Toronto Film Festival on Monday night.

Aniston stars in the low-budget drama as Claire, a caustic and tortured character who appears visibly and emotionally scarred as she probes the suicide of a fellow member (Anna Kendrick) of a chronic-pain support group. "The truth of the matter, that's not how it always is. We don't always have our heels on and our makeup on. There's beauty in pain, or grief or an award show. There's beauty in all of it," she said.

Cake, written by Patrick Tobin, also stars William H. Macy, Adriana Barraza, Felicity Huffman and Sam Worthington.

Aniston — who goes makeup-free, has a prosthetic scar running down her face and wears a back brace in the movie — said it was "extremely humbling" to allow herself to fall apart physically and emotionally during the five-week shoot as she struggled to capture the physicality of her character.

"We know there are people out there — and it does make you appreciate, by living in that body for that long … that we can get up and stand up and run and that we are all very blessed," she said.

The Toronto Film Festival runs through Sept. 14.