The X Factor judge confirmed the happy news on Wednesday via her Twitter saying: "Woo hoo I'm gonna be a mummy! :-)".
Sister Kylie Minogue also tweeted her excitement for the mum to be "Congratulations to my sister Dannii and her partner Kris on the happy news!!!! I am so excited to be an Aunty again!! WOW WOW WOW!! xxx".
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[Image via Ramey Pix.]