Update

Benjamin Millepied, Natalie Portman Welcome Son

By Alla Byrne and Julie Jordan

UPDATED 06/15/2011 at 09:35 AM EDT • Originally published 06/14/2011 at 08:15 PM 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.

PHOTOS: Natalie Portman's Red Carpet Bump Style