Juggling a marriage, two young children and a career as an international pop star can take its toll, and Shakira is opening up about the tough demands of “having it all.”

In an interview with Spanish magazine Viva (via Hola!), the “Hips Don’t Lie” singer explained that coordinating schedules with her husband, Barcelona FC star Gerard Pique, can be challenging when it comes to the couple’s two sons, 4-year-old Sasha and 6-year-old Milan.

“Sometimes it´s very hard when you can not see your sons for a month or even more. It is so hard,” said Shakira, 42. “But we call each other via FaceTime, so we are in constant communication, that helps.”

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When it comes to parenting, she admitted that she and Pique, 32, have been making it up as they’ve gone along.

“We have never been a traditional couple,” she explained. “We don’t have a written deal to share the tasks or anything like that, but we both are very involved in parenting and try to sort it out the best we can, we support each other and we also find a huge help in our families. We don’t know a different way to do it!”

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Currently enjoying the success of her latest album, El Dorado, Shakira also revealed that when it comes to predicting whether one of her songs will be a hit, she leaves that to arguably the most famous part of her anatomy.

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“Best case scenario, it’s my hips who predict if it will be a hit!,” she joked. “But truth to be said, I usually focus on the dance, that’s the benchmark I use to check if something will musically work or not.”

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Style Evolution: Shakira