Natalie PortmanNatalie Portman is expecting a baby boy with fiance Benjamin Millepied, according to reports.

Life & Style is quoting a source close to the couple, who says the pair could not be happier but are hoping to keep the information a close secret.

"They've only told a very small group of family members and friends that they're expecting a son," the source said. "They are so excited. Benjamin cannot wait to be a father."

Portman is due in late spring or early summer.

Last Sunday at the BAFTAs in London, Portman won the leading actress trophy for her role in 'Black Swan,' but the film's director Darren Aronofsky picked up the award on her behalf. He said that Portman wished she could be there but was not able to fly because of her pregnancy.