A Baby Boy Gives Natalie Portman!

Natalie Portman gave birth to a baby boy, a source confirms to Us Weekly. It is the 1st 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 of the stunning pair. "There was no way the attraction could be missed. I do not 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 opened up about her impending motherhood, and her hubby to be.

Nabbing the Best Actress in a Drama award at the Jan. Sixteen 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!"

Accepting her Best Actress trophy at the Academy Awards February 27, Portman wept tears of joy as she thanked "my beautiful love." who helped escort her to the podium. "[He] has now given me my most important role of my life," she said.

After that triumphant night, the happy couple retreated to the Napa Valley for a romantic "babymoon" in California wine country. "They were really low key," a witness told us.

Portman's impending motherhood also inspired her to break from her famously strict vegan diet. She said during an April radio interview, "I actually went back to being vegetarian when I became pregnant, just because I felt like I wanted that stuff, I was listening to my body to have eggs and dairy and that sort of stuff."

After the April premiere of Portman's smash Thor (she also scored a hit with January's comedy No Strings Attached) the Harvard grad and Millepied laid low, with her faithful pooch, Whiz! In NYC as she waited out her third trimester.

Portman told reporters in February, "One of the most exciting things about being pregnant is that I'm accepting the complete unknown. It's a complete mystery and miracle, It's really just accepting that I have no idea, which is what all of us live every day."