Familiar to millions as the star of Doctor Who, David's TV career stretches back to the early 1990s, with parts in Takin' Over The Asylum and Rab C Nesbitt.
Since 2004, he's had a string of high profile roles, including He Knew He Was Right, Blackpool, and Casanova.
What's he been in?
David made his Doctor Who debut, regenerating from Christopher Eccleston, in June 2005. Since then, he's been at the helm of the TARDIS, alongside companion Rose, played by Billie Piper.
As DI Carlisle in 2004's Blackpool, he tried to frame Ripley Holden (David Morrissey) for murder so he could steal his wife, Natalie (Sarah Parish).
While in 2005, he won the hearts of women everywhere in his role as legendary lover, Casanova.
In He Knew He Was Right, he had the opposite effect when he played the slimy Reverend Gibson.
One of his early roles on TV was Campbell in the acclaimed series Takin' Over The Asylum, alongside Ken Stott.
He's done loads of work on the stage, including roles with prestigious companies such as the Royal Shakespeare Company and the National Theatre. He was nominated for an Olivier Award* for the role of Jeff in Lobby Hero at the Donmar.
It was while he was appearing in The Pillowman at the National that he was spotted and offered a role in Harry Potter and the Goblet of Fire, playing Barty Crouch Jr.
Other drama credits include the live re-make of The Quatermass Experiment and Secret Smile, both in 2005. In 2006, he played Jean-Jacques Rousseau in the drama documentary The Romantics.
Did you know?
David's been a life-long fan of Doctor Who, and even had a little Tom Baker doll when he was a child. He cites Tom as one of his acting inspirations. Before landing the title role, David appeared in several Doctor Who audio stories, and the BBC webcast The Scream of Shalka.
He has auditioned 16 times for a role in detective drama Taggart, but never got a part!
He used to lodge with Arabella Weir from The Fast Show, and is now godfather to her youngest child. Coincidentally, she has played a female Doctor Who.
He learnt to act at the Royal Scottish Academy of Music and Drama.
David's birthday is 18th April - his real name is David McDonald.
His father is a minister in the Church of Scotland.
He used to date Anne-Marie Duff of Shameless and The Virgin Queen fame. His current girlfriend is the actress Sophia Myles.
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