Boris Johnson exchanged sexual messages with Jennifer Arcuri - including while he was performing his duties as Mayor of London, it is alleged.
In her bombshell interview with the Sunday Mirror, the American businesswoman lifted the lid on her four-year relationship with Mr Johnson.
She said they exchanged sexual messages including an “arty” picture of her topless – which Boris described as “enough to make a bishop kick through a stained-glass window”.
On one occasion, in November 2015, he sent a "desperate" plea for an intimate photo of her, while they were both in Tel Aviv, Israel.
Texts seen by the Mirror show they discussed meeting at the King David Hotel, where Johnson was a guest of the Israeli Ministry of Foreign Affairs.
Johnson wanted to see pictures of Jennifer, texting: “Photo x.”
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She asks playfully: “Is that a statement or a request? ;-)”. Johnson replies: “It is a desperate request xxx.”
Jennifer says she obliged by sending him a raunchy photograph.
She reveals: “That is a classic illustration of him being burnt out on these trips. He screwed up and meetings were cancelled.
“I remember him being emotionally needy and wanting pictures. It was playful banter. These little things reveal more about the man, everybody has a weak moment.

“He’s far from home, he doesn’t have a lot of friends he can trust, count on and rely on. It made sense he reached out to me, on a human level.”
Describing another intimate picture, she said: “That was one of my really very sexy photos. I had some topless ones I took by a fireplace. You don’t see me topless, but you see the silhouette of my breast. It’s a pin-up kind of look. I went to the polo and I won a photoshoot.
“That’s when I did other photos for him – vignette, black and white, totally tasteful, topless. One of the guys who did all my tech events asked to do a photoshoot with me.
"That’s where the photo with the pearls and the fur coat in the stairwell, that’s where that came from. When I did a shoot, he might say I’m desperate, or I miss you, and I’d respond with a photo.”
No 10 declined to comment.
- Read Jennifer Arcuri's full story in the Sunday Mirror, in shops today.