Sia performs onstage at the 2016 iHeartRadio Music Festival. TNS.

Pop star Sia has become a grandmother for the first time at the age of 44, just weeks after announcing she had adopted two teenage sons.

The “Chandelier” performer adopted two adult sons in 2019 and revealed in an interview with Zane Lowe on Apple Music this week that one of them had recently become a father.

“My youngest son just had two babies, I’m just immediately horrified,” Sia joked.

“No, I’m cool. They call me Nana. I’m trying to get them to call me Lovey, like Kris (Jenner). I’m like, ‘Call me Lovey’... I’m a f***ing grandma!”

In May, the Australian singer opened up for the first time about adopting her sons, who were both 18 and “ageing out” of the foster care system at the time.

“I actually adopted two sons last year, they were 18 but both are now 19, (they were) ageing out of the foster kid system and I love them,” she said.

“I’m a little bit jaded now after investigating the foster system as much as I have done in the last year.

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“It’s failing us. Not in my experience, in my sons’ experience. They’ve been in 18 different locations in their 18 years.”

She went on to reveal that her sons had suffered "conditioning and complex trauma" while in foster care but have "bloomed" since coming out of the system.