Carrie Symonds is Boris Johnson's fiancee and the mother of his baby.
She is a also a former special advisor, committed animal rights activist and Brexit supporter. And, not that long ago, she was director of communications for the Conservative Party.
It's that political experience that has fuelled questions about how much influence she has over decisions made in Downing Street. The Bow Group think tank this week called for an inquiry into her role.
Mark Coles profiles the woman who has been making waves, and headlines, in recent weeks.
Producer: Simon Maybin
Researcher: Maia Lowerson
Editor: Rosamund Jones
Studio manager: Graham Puddifoot
Production co-ordinator: Aretha Holmes