The mother, 36, who currently resides in Vienna, and the boy are doing well, doctors said. The baby weighed in at 3.6 kg (7.9 pounds).
The soloist at the Mariinsky Theater in St. Petersburg, Netrebko has been described as "a genuine superstar of the 21st century" by Musical America and was named 2008 Musician of the Year by one of the world's most prestigious music magazine.
In July 2006, Netrebko received Austrian citizenship. The opera star became engaged to Uruguayan baritone Erwin Schrott, 36, in late 2007.
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