David Tennant and Freema Agyeman turned up to the special preview of the first episode of the third series! It's called Smith and Jones.
Freema has just joined the show as the Doctor's new assistant, Martha Jones. She replaced Billie Piper who left the show last year.
The preview was a bit like a premiere, which is really unusual for a TV show! Lots of celebs turned up, including presenter Jonathan Ross and his children.
And here's DJ Jo Willey with hers - standing scarily close to a Dalek!
Here's David striking a pose next to the famous Tardis!
Judging by his face, maybe David's more scared of the Daleks than he's ready to admit?
Freema told Newsround she's had loads of fun filming the 13 episodes - and that so far fans have been really friendly towards her.
Lizo made sure he got all the best Doctor Who gossip at the launch - and who better to get it from than the Doctor himself!
The first episode will be seen on BBC One on Saturday 31 March.