Reese Witherspoon says it's important for successful women to be confident.

The 37-year-old actress - who was arrested for disorderly conduct earlier this month after drunkenly asking police if they knew who she was when they stopped her husband Jim Toth for driving under the influence (DUI) - believes there is still a tendency for high-achieving females to be too modest when they should be proud of their accomplishments.

She said: ''As women, we shrug and smile and say, ''Oh ... me?'' Because it makes it socially acceptable for us to be successful. But there is a balance between being an arrogant jerk and being someone who is proud of their accomplishments. We need to let successful women show off and support them. Because men don't spend any time putting themselves down. They don't waste their breath.

''You have to be the best version of yourself and, if that means you have to be a bit self-promoting, then it's OK. It really is. Because who's going to believe in you more than yourself? Other than, maybe, your mother.''

The 'Mud' actress also admitted her memory has suffered since she gave birth to son Tennessee, her first child with Jim, six months ago.

Reese - who also has daughter Ava, 13, and son Deacon, nine, from her marriage to Ryan Phillippe - added in an interview with the new issue of Red magazine: ''Ever since I had the baby, I can't remember anything. Serious, this child stole my brain.

''I'm losing friendships over forgetting to get back to people. But you can't keep up with everything. I've got a 13 year old, a nine year old and a baby.

''It's like CNN ticker tape running through my mind at all times, 'Where is Ava? She's OK. Good. Where is Deacon? He's OK. Good. Where is Tennessee? Is he OK? Yes. Great. Back to Ava...' It doesn't stop.''