Karen's shaved her locks off

Karen Gillan has shocked fans by showing off her completely bald head.

The actress whipped off a red wig during a talk promoting new movie Guardians Of The Galaxy at the Comic-Con International event in San Diego on Saturday.

Karen, 25, has shaved her locks off to play evil pirate Nebula in the upcoming sci-fi flick.

I might have done something a little bit crazy!’ the former redhead revealed during the panel session.

She then removed the hairpiece and tossed it into the audience who cheered as she showed off her bold new look.

It’s liberating. I think everyone here should shave their heads,’ Karen told the crowd.

It’s a drastic transformation for Scottish actress Karen, who’s best known for playing sidekick Amy Pond in Doctor Who.

She left the series last year.

Watch Karen Gillan unveil her dramatic new look…

SEE PICTURES Doctor Who – past and present

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SEE PICTURES Karen Gillan at Scottish Fashion Awards 2012

Anna Francis