The 37-year-old has been embroiled in a bitter row with rugby ace Ben's ex-wife Abby, also 37, following reports of a relationship with her former Strictly Come Dancing partner.
Blasting claims of her 'sh*gging other women's husbands', Kristina fumed: "How pathetic your life must be if you find time to tweet something like this. Poor you. Get a life? Or an education or both [sic]."
She also suggested she's planning to set the record straight with a new autobiography.
Responding to a positive message, Kristina said: "It's all good. Just more for my book to write. Thanks for support xx [sic]."
In 2014 Abby split from hunky Ben – 13 years after tying the knot – following his appearance on Strictly the year before.
Following new reports earlier this year that Kristina and Ben were an item, it was claimed this week that Abby has filed for a quickie divorce from the father of her twin daughters.
She took to Twitter at the weekend to share a quote about karma, adding: "@KRihanoff there you go my lovely… [sic]."
Ben and Kristina have consistently denied allegations that they had a romantic relationship while he was still with Abby.
The Mirror reported this week that Ben and Kristina are seeing each other, with a source telling them: "[He] admitted he was now with [her] – but he insisted it is recent."