The 48-year-old pop star has allegedly broken off the engagement to Joshua, 29, and has thrown him out of their West London home.
The Can’t Get You Out of My Head singer met Joshua on the set of US series Galavant in 2015 and the pair later announced their engagement in February 2016.
But it may have all come to an end as Kylie is said to have broke it off because she suspects the British actor of cheating with another actress, according to The Sun.
A source told the publication: “She is absolutely devastated, totally heartbroken.
Kylie Minogue has reportedly split from Joshua Sasse
Kylie met the British actor on set Galavant in 2015
“She really believed he was The One. But she no longer trusts him.”
The actor – who is most known for his role in the ABC series Galavant – met Spanish actress Marta Milans last year and Kylie reportedly became suspicious over their relationship.
They worked together on the now axed TV drama No Tomorrow in Vancouver, Canada.
In a recent interview with the Daily Mail, Kylie revealed she would take Joshua’s surname once they were married.
She said: “Sasse is a great name. Kylie Sasse is a great name. It’s a great stage name. Kylie Minogue has never exactly tripped off the tongue.
The pair announced their engagement in February 2016
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“I’ll definitely be taking Sasse but there will be Minogue in there somewhere. Taking a different name makes a statement…”
Last weekend, the Australian singer posted a snap on Instagram of her back in the studio.
But her ring finger was noticeably missing from the group photo.
Before Joshua, the former Neighbours actress was in a relationship with Spanish model Andres Velencoso for five years and also dated French actor Oliver Martinez from 2003 to 2007.
Express.co.uk has contacted Kylie Minogue’s representative for comment.