"I love my jeans and my sweats - I'm really just a tomboy at heart. So it's really hard for me to be like Kim Kardashian and be make-up and hair ready every time I go out of my house. I'm not a believer in that, you know? When you do wear those sweats, you're like, 'Oh God, I should step it up a notch.'" Singer Britney Spears sometimes regrets her more casual outfits.