Kim Kardashian ''hates'' herself when she falls asleep wearing make-up.

The 31-year-old socialite usually takes great care of her skin but admits she sometimes forgets to remove all her cosmetics before going to bed, which really annoys her.

She said: ''I fell asleep in my make-up two days ago. My skin was perfect and then I fell asleep with all my make-up on. I woke the next morning and was like, 'Why did I do that?' I hate myself every time I do it.''

Kim - who is currently dating Kanye West - says she likes to regularly scrub her skin as well as putting sunscreen on in order to keep her looking her best.

She told heat magazine: ''I use Per-fekt. It's a face wash, toner and a moisturiser. I put sunscreen on afterwards and I use a scrub three times a week.''

However, she admits the biggest beauty blunder she can make is not having her face match the rest of her skintone.

She said: ''Sometimes your face will be too pale for your body, and that sucks.''