Natalie Portman is reportedly pregnant with her second child.

The Oscar-winning actress set the rumour mill into overdrive after appearing on the red carpet at the Venice Film Festival.

Dressed in a flowing white gown, which drew attention to her chest, Natalie was glowing.

Natalie Portman sparks pregnancy rumors at her Venice film premiere https://t.co/jirvdr39lD pic.twitter.com/t8dY8mWR2p

— Daily Mail Celebrity (@DailyMailCeleb) September 8, 2016

US Weekly has reported straight away that Natalie is expecting her second child with her husband Ben Millepied.

She looked stunning as she sashayed in front of cameras in her floor length white frock with a classy train and a splash of red lipstick.

An onlooker told the magazine, that Natalie was rubbing her stomach at the star-studded event.

Red carpet in black&white per Natalie Portman e Lily-Rose Depp a #Venezia73 . Tutte le foto https://t.co/PyS1oiDQjh pic.twitter.com/R05oiOj7GQ

— Vogue Italia (@vogue_italia) September 8, 2016

Natalie met her husband on the set of 2010 film Black Swan and married two years later. They are already parents to son Aleph, five.

In July, Portman told The New York Times ‘’t 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.

#NataliePortman is pregnant with baby #2! Check out her adorable bump debut! https://t.co/Q76NKSUt7N pic.twitter.com/B5npxB6Ibd

— Perez Hilton (@PerezHilton) September 8, 2016

"And things get bad and stressful easily on films."

There has been no comment from Natalie Portman as yet!