Chris Hemsworth was ''nervous'' about cutting her hair.

The 'Blackhat' star, who has two-year-old daughter India and 10-month-old twin sons, Sasha and Tristan, with Spanish wife Elsa Pataky, recently chopped off his signature shaggy locks in favour of a more ''practical'' style, but admits he ''felt like I was losing my powers.''

Asked about his decision to go shorter, the 31-year-old Australia actor said: ''I was nervous. I'm a Leo so it was a little bit like losing my mane. I felt like I was losing my powers.''

But Chris told 'Live with Kelly and Michael' that he has no regrets about changing her appearance, explaining: ''It got long and messy and time consuming. It's like photo-shoot hair -- if you have someone following you around doing it for you, it's cool, but it's not practical.''

He jokingly added: ''I got it backstage in a bag so I'm gonna hand it out.''

Chris also felt very uncomfortable while visiting some prisons with his ''long blonde pony-tail for 'Thor' '' ahead of shooting his new movie, in which he plays a hacker.

He said: ''We went to a number of prisons and spoke with inmates. I sort of naively thought I'll go in and do some character study, and then I got to the prison and instantly thought oh what am I doing here.''