Flame-haired Karen Gillan, 22, who plays feisty Amy Pond alongside new Doctor Matt Smith, insisted on showing a shapely leg despite the freezing conditions.
She admitted yesterday: “Yes, the skirt is quite short. Initially, they wanted me in trousers, just because of the practicality of running around.
“But I wanted the mini-skirt because I think it really suits Amy’s sassy character.”
Matt, 27, chimed in: “Oh, and let’s say it out loud – it’s SEXIER, isn’t it? Come on!”
The new Time Lord, who will be on our screens in the spring after taking over from David Tennant, says he hopes to bring a new kind of chemistry to the role.
Speaking during a break in filming at Cardiff Bay, the 11th Doctor said: “My character will be less tolerant than a lot of those who have gone before him.
“And Amy’s got real fire in her belly. But there’s also great affection and love there, and we’re developing that all the time.”
The pair have now been working together for six months and say they are getting on like a Dalek on fire.
Talking about their first meeting, Karen told Doctor Who Magazine: “I was actually quite intimidated, because, you know, he’s Doctor Who. It was all very scary.
“But he was very friendly, and made me feel at ease.”
Matt joked: “I do the reverse of that now – I’m a complete git.”