Black Swan's duckling has hatched!

Natalie Portman gave birth to a baby boy, a source confirms to Us Weekly. It's the first child for the actress, 30, and fiance Benjamin Millepied.

Portman and French-born ballet star Millepied, 33, met and fell in love on the set of Black Swan, in which he served as choreographer and co-star.

"It was seductive to watch them," a set source told Us Weekly of the stunning pair. "There was no way the attraction could be missed. I don't think he could help himself -- she's dazzling!"

To the surprise of fans everywhere, Portman announced her pregnancy and engagement in late December of last year -- and showed off her engagement ring and growing baby bump throughout the 2011 awards show season. 

And, as Oscar buzz heated up over her intense performance as tormented, obsessed ballerina Nina in Black Swan, the often-private star (whose ex beaus include folk singer Devendra Banhart, SNL's Andy Samberg and Spanish actor Gael Garcia Bernal) opened up about her impending motherhood -- and her hubby-to-be.

Nabbing the Best Actress in a Drama award at the Jan. 16 Golden Globes, she joked that Millepied played a dancer who "wouldn't sleep" with her Black Swan character. "It's not true!" she said, laughing. "He totally wants to sleep with me!"

More at usweekly.com.