She can be seen starring in the new series of Channel 4's No Offence, but what else do we know about her, and who she married to? Let's get the lowdown…
Joanna was born in Cheshire On October 2, 1961 – that makes her 56.
She kicked off her acting career in 1994 – playing a nurse in ITV1's Peak Practice.
She also starred in in The Other Boleyn Girl with Natalie Portman and Scarlett Johansson.
However, she made her name playing incompetent press officer Terri Coverley in TV series The Thick of It from 2005-2012.
Other than her aforementioned telly roles, Joanna has starred in the following TV shows and films:
Joanna keeps her private life relatively private.
But we know that she's married – to an accountant named Neil, and the pair live together in Purley, South London.
She says she doesn't have any children because she and Neil met too late.
She said: "I’d have loved to become a mother but I suspect I wouldn’t have been able to be a very good actor or an artist had I been one.
"There was a point in my own life, when I was in my mid-thirties and saying, ‘Oh, I want babies’, and both my parents said to me there is more to life than having children. Which you could take in two ways.
"But I think what they meant, their unfulfilled artistic expression perhaps was curtailed by having a family, and perhaps I wouldn’t have been able to manage both. My deep suspicion is that I would have prioritised children above having an artistic life."
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