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That's her on the left. Lovely, isn't she?
Olivia is famous for her portrayal of Sophie, Mark's object of love and misplaced stalking - I mean, devotion - in Peep Show.
But she has also been in pretty much every funny thing going in the past few years: The Office, Look Around You, Help and Green Wing. It was during her stint on Bruiser that she met David and Robert, as well as Martin Freeman (The Office) and Matthew Holness (Garth Marenghi).
She regularly features in BBC Radio 4 comedies, such as Think The Unthinkable and the original radio series of That Mitchell and Webb Look, That Mitchell and Webb Sound.
In fact, she is so funny Channel Five asked her to provide the voiceover for their poll of Britain's Funniest Comedy Character. (It's Basil Fawlty. It's official now and has been scientifically proven, so no arguing.)
She plays Julie in Numberwang, a Stone Age detective and a chiropractor's assistant.
And yes, all right, all right - she plays "Bev" in those car ads.