Natalie Portman is pregnant with baby No. 2, debuts baby bump

Natalie Portman has a baby on the way!

The 35-year-old actress debuted a growing baby belly at the premiere of her film "Planetarium" at the Venice Film Festival on Thursday, September 8.

The Oscar winner wore a blush pink, one-shouldered gown, which clung to her maternity curves. She wore her hair pulled back and was absolutely glowing. Onlookers at the festival said Portman was affectionately rubbing her belly as she walked down the red carpet.

Portman kept her baby news under wraps earlier this week a the premiere of her film "Jackie" at the festival. Then, she wore a black and white dress with a billowing skirt that kept her bump concealed. But now it appears she's ready for the world to know!

Portman's baby news means she and her husband, choreographer Benjamin Millepied, will officially be a family of four. The duo are already parents to son, Aleph, 5. The happy couple met on the set of her Oscar-winning film "Black Swan" in 2010 and married in 2012. The pair recently moved their family back to Los Angeles after living in Paris where Millepied was the director of the Paris Opera Ballet. Portman joked that Parisians are cooler, but she likes living in California where people seem friendlier.

She's also likely excited to raise her child in Los Angeles as well.

In July, the Oscar winner explained how motherhood has changed the way she works. "I think being a mother made me realize how maternal the role of director is," she said during an interview with the New York Times magazine T. "It made me much calmer under stress because there's that weird parent thing you develop, that when things get really bad, your voice gets calm and your blood pressure slows and you can make everything OK again. And things get bad and stressful easily on films."

Congrats to the happy family!

PHOTOS: See all the stars at the Venice Film Festival