Baby joy for Black Swan star Natalie Portman

Natalie Portman with Black Swan director Darren Aronofsky

Natalie Portman with Black Swan director Darren Aronofsky

Natalie Portman has become a mother.

The Black Swan star has given birth to a baby boy, according to People magazine.

The Jerusalem-born actress, 30, is engaged to the baby's father, choreographer Benjamin Millepied.

Ms Portman has not yet revealed the name of her firstborn.

Last updated: 9:50am, June 15 2011