- In early July 2007, it was announced that she would be the new companion in Bác Sĩ Vô Danh (2005), reprising her role as Donna Noble from the 2006 Christmas episode. She joined David Tennant (the Doctor) and Freema Agyeman, the previous companion, halfway through the fourth series. Three years Tennant's senior, she is the first companion older than the actor playing the Doctor she accompanies.
- Has a daughter Erin Johanna, born in January 2003, with her partner Twig Clark. Catherine became pregnant before filming Wild West (2002) and in the first series is very clearly showing under the baggy cardigans and hippy clothes she wears to play Angela.
- Catherine is a patron for the youth cancer charity, The Laura Crane Trust.
- Raised by her mother, Josephine. She has had no contact with her father at all. Josephine had left him before Catherine was born.
- Endured a traumatic and difficult labour with her daughter Erin, resulting in her having to deliver her via emergency Caesarean section and later post-natal depression for Tate.
- Acted as patron of the 2007 Young Writers' Festival at the Royal Court Theatre in London.
- She spent a year with the Royal Shakespeare Company before she turned to stand-up comedy. Has also performed at the National Theatre.
- Is a graduate of the Central School of Speech and Drama.
- Catherine grew up in Bloomsbury's iconic Brunswick Centre.
- Former member of the National Youth Theatre.
- About to begin six months of filming Bác Sĩ Vô Danh (2005) in Cardiff. (July 2007)
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