Symonds was thrust into the media spotlight in July 2007 when she almost became a victim of serial black cab rapist John Worboys
Symonds was 19 at the time when Worboys picked her up in his taxi from London's King's Road after she had been clubbing.
In an interview with The Telegraph Symonds told how Worboys convinced her he had won money at the casino gave her champagne.
"I felt indebted to him because he had given me a cheap lift home," she said. "But when I got the glass I secretly poured it on to the floor as I was worried it might be spiked."
Luckily Symonds was able to leave the cab and made it to her front door.
"I played the age card and told him I was very young, only 19, and needed to go home."
In 2009 Worboys was convicted off sexually assaulting 12 women.
Source: The Telegraph, BBC
After that Symonds worked in communications for the Conservative Party, first as head of broadcast and then as a political press advisor.
The job followed roles in the offices of cabinet ministers Sajid Javid and John Whittingdale.
Symonds left the Conservative Party in 2018 to head-up Bloomberg’s eco-initiative Vibrant Oceans.
Vibrant Oceans partners with coastal communities, nonprofit organizations, local and national governments, policy makers, and academic groups to advance evidence-based conservation practices and implement data-driven fisheries management policies around the world.
Source: Bloomberg
Johnson and Symonds' romance was confirmed on June 20, 2019, when police were called to a quarrel at Symonds' apartment in Camberwell, south London.
When police turned up Johnson was present, and a neighbor told the Guardian they had heard a woman screaming followed by "slamming and banging."
The neighbor said Symonds could be heard telling Johnson to "get off me" and "get out of my flat."
Source: Guardian
Several days after, the couple shared this photo with The Daily Mail. It was widely derided for being staged.
Johnson refused to deny that the photo was staged.
If Johnson is elected prime minister, and the pair wed, it will be the first time a marriage has happened in office for 250 years.
Even if the pair wanted to marry, they cannot do so immediately, as Johnson's divorce with Marina Wheeler is not yet finalized.
Source: The Sun, The Daily Telegraph
Symonds reportedly won't move into Number 10 immediately after Johnson becomes prime minister, and will wait a few days to avoid a media storm.