Enrique Iglesias and Anna Kournikova Welcome Son Nicholas and Daughter Lucy: Report

TMZ reports that Enrique Iglesias and Anna Kournikova's twins Nicholas and Lucy were born on Saturday, Dec. 16, in Miami

Surprise! Enrique Iglesias and Anna Kournikova are parents — of two.

The longtime couple are said to have welcomed twins —a boy and a girl — over the weekend, TMZ reports. The outlet says the babies’ names are Nicholas and Lucy, and that they were born on Saturday, Dec. 16, in Miami. A rep for the musician had no comment, while a rep for the athlete did not immediately return PEOPLE’s request for comment. A source confirms to PEOPLE that Kournikova was indeed pregnant.

The newborn babies are the first children for both Iglesias, 42, and Kournikova, 36, who have been together for over a decade and a half.

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While the couple don’t often open up about one another, Kournikova told Women’s Health in 2011 that kids were definitely on her agenda, but marriage wasn’t a priority.

“I absolutely want to have children, whether I have my own or adopt,” said the Russian retired tennis star, adding, “I love taking care of people.”

Continued Kournikova, “[Marriage] isn’t important to me. I’m in a happy relationship – that’s all that matters … I believe in commitment. I believe in being open and trusting each other and respecting each other completely.”

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And according to Iglesias, Kournikova is more than the right fit for the job of mom. Speaking to PEOPLE en Español in 2007, the singer admitted, “The only thing I can say is that, in my opinion, Anna, whether we are together or not, would be an ideal mother.”

“I think she’d be the perfect mother, and I say it regardless of whether I’d be with her or not,” added Iglesias of The Biggest Loser alum.

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The couple are extremely private, rarely being photographed together. In August, Kournikova did share a video to Instagram, showing the mom-to-be working on her fitness outdoors.

“#letsdothis 💪🏻😂🐾😉 ,” Kournikova captioned the clip, in which she’s wearing a loose-fitting tank top while working with resistance bands as two dogs look on from more relaxing lounging positions.

• With reporting by BECKY RANDEL and JORDAN RUNTAGH