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Doctor Who star Matt Smith has admitted his sexy new co-star Jenna-Louise Coleman has reinvented the show because the character was becoming “a grandad”.

The actor, 29, dubbed Jenna “smokin” and said she was going to make a big impression when she joined the show in the Christmas special.

Matt said: “Jenna is pretty smoking. She is doing really great, coming into something so big she has done so well.

“I think people are going to really like her. She works incredibly hard and is incredibly detailed. She is a joy and I lucked out again.

“I look back to my first day and I was like a rabbit in a headlights. She is much more assured than me. But I have tried to help her into the process of making the show.

“It is a big lifestyle change. She will be a fantastic companion.”

Asked how the dynamic would change having one companion again, instead of Amy Pond and Rory who died in the last episode, he said: “I was thinking about it the other day and Rory used to take care of Amy quite a lot, so the Doctor became a weird old grandfather.

"He was ostracised in some way. So it is nice having a different dynamic.

“That is what is exciting about the show, you kind of get a first episode again. I think all these stories come to the end of their cycle.

"The Ponds had a wonderful time.”

Matt was speaking at the Doctor Who Experience in Cardiff as he had his hands cast in cement.

Asked if he suffered in the spotlight like Daniel Craig, who said this week he couldn’t go to a pub because he is mobbed, Matt said: “I think you have to live your life as normal as you can.

"I take the Tube and I wear a hat because I think you should go about your everyday life.

“Daniel Craig is a superstar. I’m not quite on his level but hey that is the plan.”

Matt said he would only know what legacy he would leave as a Timelord in “ten years time” but he hoped some kids would grow up and one day describe him as “their doctor”.

He also said the stress of the show had given him “a few grey hairs” but he still has other adventures he would live to go on through space and time.

Matt added: “I think there would be fun episodes in Iceland and South America. I would love to go to Peru, think of the inca trail.

“If anyone is listening and wants to take us there.”