Kim Kardashian West thought Kylie Jenner would ''ruin her wedding'' when she died her hair blue.

The 'Keeping Up with the Kardashians' star was furious when her 17-year-old half-sister showed off a dramatic new look shortly before she was due to marry Kanye West in May, but grew to love the teenager's bold colouring.

Kim admitted: ''I gave Kylie such s**t for dying her hair blue, especially at the time of my wedding, and I was so upset and I thought 'She's going to ruin everything!', I didn't understand it.

''Looking back, I loved it and even towards the end I really started to love it.''

And the 34-year-old beauty - who has 17-month-old daughter North with Kanye - even admitted she would consider copying the blue hue, but only if she totally changed her hair style as well.

She told Britain's Glamour magazine: ''I it was short - and how Kylie did it - I think I would. I'm not saying I will, but... I would be into it.''

Despite her polished appearance, Kim admitted she doesn't wash her hair very often.

She said: ''I don't wash my hair every day. I really try and stick with - y'know, if I'm getting it done, I'll get a blow-out on the first day, and on the second day I'll add waves and curls to it, and on the third day I'll keep that messy, and on the fourth day stick it up, and then wash it that night.''