"Happy 50th to my baby sister @danniiminogue … oh and, she 'just wants to party now' 😂 GO FOR IT. LOVE YOU!!!!!!!!!! 💓🕶🍰👩🏻🤝👩🏼💞💥🎤💝 50.
"I can hardly believe it. So proud of you," she wrote.
Danni marked her big day with a Reel on her Instagram of her sipping champagne and dancing with 50th themed balloons.
In her caption, she thanked everyone for ushering in her milestone.
"So much birthday love today, and I'm feeling every bit of it," she began.
"Loving all your posts and messages and memories. Thank you for making my special day feel extra special, Dx 💕💕💕," she finished.
In the post's comment section, a slew of celebrities wished her a happy birthday.
Lindsay Lohan wrote, "Happy birthday! 🎉🎂🥳🤩," and Anthony Callea commented, "Hope you're jumping to the beat 𝑫𝑰𝑺𝑪𝑶 𝒔𝒕𝒚𝒍𝒆 on your special day…. 𝑯𝑨𝑷𝑷𝒀 𝑩𝑰𝑹𝑻𝑯𝑫𝑨𝒀! 🥂🎈."
The newly-minted 50-year-old's Masked Singer co-star Jackie O shared a selfie on her Instagram, and she penned a gushing message filled with high praise.
"Happy 50th birthday to one of the kindest people I know. @danniiminogue, you are an inspiration to many, including me.
"You never say a bad word about anybody, you care more for others than you do yourself, you're smart, beautiful and funny as hell, I adore you so much."
She finished her post: "Hope you have a wonderful day ❤️❤️❤️."
In her comment section, Osher Gunsberg aptly chimed in, "The greatest. Ever."
The Block's Shaynna Blaze also made a post for her friend, and she posted fun filled pictures from a concert they attended.
"Happy special Birthday to this absolute divine human being. It's a privilege to know you & call you a friend. Here's to disco celebrations for the rest of the year. @danniiminogue #happybirthday #discotime," she wrote.
Dannii took to her friend's comments to make plans for a post-lockdown party.
"What a birthday 🥳 🎂🎈🎉can't wait to celebrate out of lockdown!!" she replied.
This article originally appeared on our sister site, Now To Love.