[2] Thynn was born on 26 March 1986, in London, the daughter of a Nigerian father and an English mother.
Her father, Chief Oladipo Jadesimi, is a Nigerian oil billionaire who is the executive chairman of Lagos Deep Offshore Logistics Company and is a titleholder in the Nigerian chieftaincy system, while her mother, Suzanna McQuiston, is an English socialite.
[11][16] She was featured alongside her husband in All Change at Longleat, a three-part documentary filmed in 2014 and broadcast on BBC One in September 2015.
[9][22] From September 2019, she was a contestant in the 17th season of the BBC television programme Strictly Come Dancing, partnered with professional dancer Aljaž Škorjanec.
[23] In August 2024, Thynn took part in the nineteenth series of Celebrity MasterChef on BBC One, where she was eliminated in the third heat.