Reese Witherspoon sends e-mails at two in the morning

When asked if she plans outfits ahead of time, she told PEOPLE magazine: "I don’t have time! I put the kids to bed, and I literally collapse, or I do work.

"Then I wake up at two in the morning and send a bunch of e-mails and then try to get three more hours of sleep before the baby wakes up crying."

Meanwhile, the 39-year-old beauty - who has 15-year-old daughter Ava and 11-year-old son Deacon from a previous relationship, and two-year-old son Tennessee with husband Jim Toth - previously admitted it can get quite "chaotic" balancing her home and work life.

She explained: "It can get chaotic sometimes, but whether you're working a lot or not, life with children will always be a bit unpredictable. All mothers have a lot to deal with, and I've been doing it since I was 22 and Ava was born ...

"They've seen most of my films, and needs to say my daughter loves 'Legally Blonde!' But when I come home, they see me as a mother. They want me to listen to what they've been doing, help them with their homework. It's only their friends who see me as the big movie star."