"I have had some real hair disasters. I once used henna to dye my hair brown for an audition, thinking I was being clever as it's natural. Little did I know it was the worst thing I could have done as it coats the follicles so that nothing else can penetrate," femalefirst.co.uk quoted Miller as saying.

So what did she do with the green hair?u00a0"I had to put ketchup in it for about a year to get rid of the green tinge," she said.u00a0The 30-year-old is expecting her first baby with boyfriend Tom Sturridge.u00a0