Dannii Minogue
She famously feuded with Sharon Osbourne during her first series on the show.
Featuring festive deep cuts from Kylie, Ariana, Gaga, Lil Nas X and yes, even Mariah (no, not that one).
Darren Hayes and Sia also tweeted their happiness
Apparently this lot ceased being mates as soon as the cameras stopped rolling.
It was famously revealed the pair enjoyed a secret fling in 2007.
And not a spinning chair in sight.
The former 'X Factor' star has landed a new judging role.