Rihanna Gives Birth to Baby Boy with  A$AP Rocky

Rihanna and A$AP Rocky are officially parents ... welcoming a baby boy to the world.

That's right, it's the couple's first kid together -- sources with direct knowledge tell us

he was born on May 13 in Los Angeles -- but we don't yet know his name.

The last time we saw Rihanna was on May 9 in Los Angeles for Mother's Day weekend when she and Rocky grabbed dinner at Giorgio Baldi.

It was back in January when the couple announced they were expecting -- with an NYC photo shoot

While Rihanna looked stunning throughout her pregnancy ... wearing designer looks and proudly showing off her baby bump

A$AP was arrested just last month in a surprise bust as the couple's private plane touched down at LAX.

Nonetheless, Rihanna continued to support A$AP, even attending one of his shows, cheering for him backstage just a week after the arrest.