Stacey Simcox told the Sun that Kelly begun by texting her from Danny's phone after she made the heartbreaking discovery that her boyfriend had been secretly messaging a number of other women.
Stacey told the Sun that she received a message from Danny's phone asking to meet up again - which confused her as they had not previously met up since an initial meeting 8 months before.
And when Stacey replied and acted confused, Kelly is reported to have written ''Another Girl?? Spent an hr texting you all. It's Kelly Brook here.'
Kelly is then alleged to have sent back a naked picture of another woman who she suspected her boyfriend of meeting up with.
At the point Stacey claims she asked Kelly, 33, to call her. She said: 'Kelly called immediately. I recognised her voice but she was snotty and very angry.
She said: "Take it you're another one he's f*******. I've spoken to six other girls he's been f*******.'
Stacey's revelations hit the papers this weekend when she revealed that since meeting Danny he had bombarded her with flirty messages, and requests to meet. Stacey told the paper: 'He'd send me filthy messages about what he wanted to do to me and begging to meet up for sex.
'It got progressively more explicit and I just thought, "What a rat."'
Kelly is reported to have kicked Danny, 25, out of their home on finding the messages. The pair had been holidaying in Turkey just last week, with Kelly sharing a series of pictures on her Instagram page. She has since deleted all recent pictures of Danny.
Kelly rekindled her relationship with Danny in January of this year. The pair had previously dated for almost two years but split in June 2010.