The Australian TV star and the English model reportedly ended their nearly four-year relationship two weeks ago, according to Australian newspaper the Herald Sun.
Kris - who has a 21-month-old son Ethan with Dannii - has allegedly moved out of the family home in Melbourne.
Kris, 33, hinted that things between him and Dannii, 40, were not well when he changed his twitter profile to a cryptic message.
The bio read: "Its nice to be important, but its more important to be nice ... not really sure what my job is any more .. but i do know i love my boy more than life... (sic)"
The `Australia`s Got Talent` judge began dating the former professional rugby player in 2008 after meeting him in Ibiza.
They moved back to Dannii`s hometown of Melbourne ahead of Ethan`s birth in July 2010 so the brunette beauty - the sister of Kylie Minogue - could be near her family.
The pair had been spending a lot of time apart recently due to work commitments, with Dannii`s shooting schedule and Kris` modelling work for Australian department store Myer often meaning they were in different cities to one another.
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