The 27-year-old X-Factor judge admitted that after a wild night out, she often forgets to take her make-up off and wakes up to find it caked all over her bed linen.
She told OK! Magazine, 'You know you've had a big night when you wake up and your pillow is covered in make-up. I've fallen asleep in my make-up a few times and I don't like it. I don't like how it makes me feel. My new year's resolution is to make sure I take it off before bed.'
She added that if she could have one wish, it would be for her hair to never need styling again.
'I'd ask for permanently blow-dried hair if a genie offered me a wish on New Year's Eve,' she said. 'I'd wake up in the morning and wouldn't even need to wash it. And I could blink and change it to whatever style I wanted.'