Benjamin Millepied, Natalie Portman Welcome Son
updated 06/15/2011 AT 09:35 AM EDT
•originally published 06/14/2011 AT 08:15 PM EDT
The actress and fiancé Benjamin Millepied have welcomed a son, PEOPLE has exclusively learned.
Portman, 30, met choreographer Millepied on the set of Black Swan, for which she later won an Oscar for Best Actress.
In December the couple announced that they were engaged and expecting their first child.