04/08/2013 Newsround

stories this Sunday. The talking robots making history in

space. And they're small, blue and coming

to a screen near you! The Smurfs are First to a massive showbiz secret so

secretive that it's even been given a code name! But in a matter of

hours, we will all know who the new Doctor Who will be. The 12th Doctor

will be revealed in a one-off live programme on BBC One at 7pm which

will also feature a special interview with Matt Smith, who

announced he would be stepping down in June. CBBC's Chris, who's a

superfan, told me why it's going to be so exciting.

It is exciting to find out something we have wanted to know for a while,

since Matt Smith announced he was leaving. They are not just telling

us. They are doing a big announcement. It is like Christmas!

This is a first. He was announced in a special press release. But tonight

is like a concert, bringing out the final act. It means we will all find

out at the exact same moment. No-one will know beforehand, apart from

those who already do. We will all be there at the same time.

Well, on the website we've been asking you, what would be the first

thing you did if you became the new Doctor? And we've had some great

More than 20,000 cyclists are expected to take part in a 100-mile

race around London today. The riders started their journey at the Olympic

Park. And thousands have already crossed the finishing line. As well

as pro riders, lots of cyclists have been taking part to raise money for

charity. It's all part of RideLondon, a huge cycling event

this weekend. Former Olympic rower James Cracknell was the first celeb

cyclist to finish the race. Having cycled around London and box Hill, I

grew up around this area, with cars normally, it is brilliant to have

total run of the road. The best thing was being in the Olympic

Park, where I was last year, and so many people were flooding like they

one year ago, but they are actually doing something rather than just

clapping. And Double Olympic gold medallist

Laura Trott sprinted to victory in the first ever RideLondon Women's

Grand Prix yesterday. She finished one bike length in front of her

rival in the 15-lap criterium event around the streets of the capital.

And the key to her success - a sneaky sandwich.

Jam sandwiches! I love them. I always make sure I make them in the

morning so they are ready, and then I have them in my back pocket to

pull out. Next to sport. He's been in the

middle of a transfer tug-of-war all summer. And the latest twist in the

battle for Gareth Bale is that his boss, Andre Villas-Boas, has

criticised Real Madrid for going public with their interest in

signing the Wales international player. According to the Tottenham

manager, Bale, who scored 26 goals for Spurs last year, is not for

sale. Now, she's had countless number

ones, two best-selling albums and sold-out live shows across the

world, but did you know Katy Perry is also a bit of an actress? She's

the star voice on the new Smurfs movie, which sees her character

Smurfette kidnapped by Gargamel, who is even eviler than last time.

Here's Nel. They are the little blue people used

to getting into big trouble. Smurfs two sees the return of an all-star

Kast, including Katy Perry in the lead role of Smurfette. The sequel

is about her story, because she was created by Gargamel, the villain,

and she found goodness. No matter what situation you are born in, you

can always grow. The Smurfs set off to rescue her after she is kidnapped

by Gargamel. But they are up against it with Gargamel even more fiendish

than before. The phone with a character like this is that he is so

evil, it is ridiculous. There is nothing subtle about him. Katy Perry

got the part after the film-makers picked her voice out of hundreds of

others. They had heard a snippet of my voice from an interview, and it

must have been a morning radio interview, because of Smurfette has

got more gravel to her voice that I typically have. Don't worry, music

fans, because Katy Perry is still working on herself album -- on her

third album. It is a lot of effort to be an actress and is not just

something I roll into. It does not always work. You really have to work

Next, the Duke of Cambridge has made his first public appearance since

the birth of his son, Prince George, just under two weeks ago. Prince

William took a breather from being a new dad to play in a charity polo

match. After the game he was presented with a child's polo

mallet. Maybe a bit big for Prince George.

And finally, a talking robot is on its way to the international space

station for the first time. Kirobo will provide company for a Japanese

astronaut who is due to arrive at the station later this year. When