'Just a reminder jane pountney is a ugly tramp and home wrecker, keep her away from your husband or boyfriend, s***.'
Jane, 49, made headlines on May 7 when Katie outed her as having a seven month 'full-blown sexual affair' with her husband Kieran Hayler.
Katie had only just announced she was six months pregnant with her and Kieran's second child.
The 36-year-old model wrote on her Twitter: 'Sorry to say me and kieran are divorcing him and my best friend jane pountney bee having a full blown sexual affair for 7 months.[sic]'
'Jane pountney is 50 next year cloned into me with my help she is a whore, home wrecker s***.'
Since news of the affair broke Kieran has made several attempts to win his wife back, including sending her several bunches of flowers and cards on her birthday last month.
And according to sources close to the star who spoke to Closer, Katie has allowed her 27-year-old lover back into her home and has even had sex with him since the incident.
But despite this, the star says a split may still be on the cards, and adds that her hormones are making her confused about what to do for the best.
Rumours have also been circulating that Jane Pountney's husband Derrick is also struggling to come to terms with the affair, and has suggested their relationship may not last after the revelations.
Read more of the latest in this week's Closer magazine, out now.