By Demeter Stamell For Daily Mail Australia
Published: 03:16 BST, 28 May 2019 | Updated: 03:16 BST, 28 May 2019
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Dannii Minogue dedicated a sweet tribute to her big sister Kylie Minogue in honour of her 51st birthday on Tuesday.
The 47-year-old former X Factor judge shared a throwback photo of herself and her sister from when they were children.
'Happy Birthday to my big sister. Now for a new year of fun and festivities. Love from Sister Disco xx,' Dannii captioned the cute photo.
Skater girls: Dannii Minogue, 47, (left) gave her big sister Kylie Minogue (right) a sweet shoutout on Instagram for her 51st birthday on Tuesday, sharing a throwback photo from their childhood
Kylie responded, sharing a series of love heart emojis and writing, 'Always!!!'
They appear to have been sitting on a step at the back of a house, with both girls seen wearing roller-skates.
The photo appears to have been taken in the late 1970's, with both Kylie and Dannii dressed in clothes from that decade.
So cute! 'Happy Birthday to my big sister. Now for a new year of fun and festivities. Love from Sister Disco xx,' Dannii wrote on Instagram. Pictured