Sia has revealed that she’s a mom to an adopted son in a cover story for GQ about Diplo, whom she performs with in the supergroup LSD.

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Sia said that much of her relationship with Diplo has just been “‘trying not to have sex so that we wouldn’t ruin our business relationship, because he’s super-duper hot.'” “‘This year I wrote him a text, and I said, ‘Hey, listen, you’re like one of five people that I’m sexually attracted to, and now that I’ve decided to be single for the rest of my life and I just adopted a son, I don’t have time for a relationship.… If you’re interested in some no-strings sex, then hit me up.””

This is the first the public has heard of Sia’s motherhood.

For his part, Diplo expalined how having children affects his lack of time for a relationship.

“‘I think I found true love with my kids. I get lonely sometimes, I might have bouts of depression. But my kids, they love me. And they can’t escape me,” he told GQ, adding, “‘any girlfriend would end up breaking up with me because I’m so busy, and I’m just a bad boyfriend. My kids, they literally can’t. My job is to be good to them.’”

Sia recently released a new song, “Original” for the movie DoLittle, which comes out in theaters on January 17.