Olivia Wilde and Jason Sudeikis are expecting their second child.

Olivia Wilde and son Otis [c Instagram]

Olivia Wilde and son Otis [c Instagram]

The 32-year-old actress posted a picture of herself and the couple's son Otis - who will turn two this week - on her Instagram page showing off their tummies and captioned it: "Matching baby bumps."

The pregnancy news comes not long after Olivia revealed she was ready for more children with Jason, 40.

She said: "I'm desperate for more [kids]! I love my siblings so much and Jason has incredible siblings too. The more the merrier.

And Olivia previously revealed she is relishing every second of watching her little boy grow up.

She said: "He is becoming a little individual and his personality is starting to emerge and it's amazing.

"I'm more and more excited to be a mother -- and to be his mother -- because I think he's a wonderful little person."

The 'Rush' actress works tirelessly on various charity pursuits as well as a busy acting career and she is keen for Otis to follow in her philanthropic footsteps when he gets older.

She said: "I look forward to bringing him to [charity events] once he's conscious of what it means because I think it'll be very important for him to have experience with this stuff like I did."

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