Celine Dion is "mesmerised" by Sia.
The 'My Heart Will Go On' hitmaker has gushed about the 'Chandelier' singer, who she "deeply admires".
She said: "She's an artist with a clear vision - for her songs, her videos, her performances. This industry can break you; it's tough. But Sia has managed to carve out her own path, on her own terms and in her own time.
"I'm mesmerised by her confidence, and I constantly look forward to what she'll do next. She's the true definition of an artist, one I so deeply admire. I'm one of her biggest fans, and it has been such a joy and honour to get to know her."
And the 48-year-old singer - who tragically lost her husband René Angélil to throat cancer earlier this year - was overjoyed that Sia penned a track for her and says her son was impressed too.
She added to Billboard magazine: "Sia is simply incredible, like no one I've ever met.
"My son René-Charles - he's much cooler than I am and teaches me what music I should listen to - couldn't believe that Sia wrote a song for me. He's a huge fan, too. I not only fell in love with the song and the words, but also with Sia's absolutely beautiful voice: It's so powerful - like nothing I had ever heard."
Meanwhile, Celine previously gushed about a track Pink wrote for her.
She said: "I can't really talk about the other writers yet because nothing has been confirmed, but trust me, I hope that Sia and Ne-Yo and Bruno Mars and all the people that we love, oh my gosh, I hope they write for me. Are you kidding me? I can just give you a little hint: Pink wrote me a song that I'm freaking out about."
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