Reese Witherspoon used to "cry a lot" on her kitchen floor.

She said: "I lay on my kitchen floor and cried a lot and I think at a certain point you just wake up and you're like 'OK, I don't want to feel like this anymore.' And you figure your own s**t out. But no one's going to figure it out for you.

"You can't apologise for being a human being. We all feel weak sometimes, sad and distraught, lost."

The 38-year-old star appears naked in 'Wild' - which is based on Cheryl Strayed's memoir about quitting heroin addiction with a gruelling 100-day hike - and though her daughter thinks the thought of seeing her nude on screen is "weird", she is very proud of the actress.

Asked if Ava will see the movie, Reese told Nylon magazine: "Yeah, we talked about it. I said, 'Ava, I've got to tell you something, I'm naked in the movie, OK, lemme explain!' She's like, 'Mom, that's so weird!'

"I was like, 'I had to be brave and I couldn't just play the parts I was comfortable with. Cause Cheryl was brave enough to tell her whole story so I had to tell the parts that even I was scared to do.' She's proud of me."