The singer and her boyfriend, Spanish soccer player Gerard Pique, had their first child, a son named Milan, in 2013.
Shakira, 37, and Pique, 27, met in 2010, but only confirmed that they had been in a relationship in March 2011.
The “Hips Don’t Lie” singer, one of the best-selling Latin pop idols, gave birth in Barcelona’s Teknon clinic, local media said, though the hospital said it could not confirm the information.
As with the birth of their first child, the couple recently asked fans in an online baby shower to buy gifts such as fresh water kits and vaccines to help needy children.
Shakira is a UNICEF Goodwill Ambassador.