A white lioness gave birth to the cubs in the Serbian capital on Monday, adding to the lion family. The zoo now has six lion cubs.
A zoo veterinarian said mom welcomed the cubs, and they're all doing fine.
White lions were traditionally considered divine, due to their coloring, which comes from a rare mutation of a species found in South Africa.
There are only about 200 white lions left in the world. White lions have become the zoo's greatest attraction.
The Associated Press contributed to this report.