- Mother is a former editor of Country Living magazine.
- Vanessa was raised in Wimbledon, London, England (within earshot of the famous tennis games).
- Shares a flat with her sister Juliet, a theatrical agent, and best friend in London's Tooting district [2019].
- At school she was a victim of frequent bullying.
- Father is urologist and prostate surgeon Roger Kirby.
- Nominated for the 2018 Emmy Award in the Supporting Actress in a Drama Series category for her role as Princess Margaret in The Crown (2016), but lost to Thandiwe Newton from Westworld (2016).
- During one of the previews of the play "Julie" in 2018 in which she played the title role, a fight broke out between two men in the balcony circle during the applause at the end. One of the men tried to push the other over the balcony railing (Lyttleton Theatre, London).
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