Benjamin Millepied and Natalie Portman
06/15/2011 at 09:35 AM EDT
It's been a big year for Natalie Portman
: an engagement, an Oscar and now a baby!
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