Olivia and fiancé Jason Sudeikis are celebrating

Olivia Wilde has announced that she’s expecting a baby with fiancé Jason Sudeikis.

The actress, 29, and SNL comic Jason, 38, confirmed yesterday that they’re ‘very excited’ to become first-time parents.

‘WOW. You guys are awesome. So kind. Thank you thank you thank you! PS. Babies eat mostly salsa right?’ Tweeted Olivia.

Olivia and Jason started dating in November 2011 and got engaged this January.

Ex-The OC star Olivia said earlier this year that she was having ‘too much fun’ being engaged to plan their wedding just yet and revealed that she was already excited to start a family.

‘[Jason]’s so good with kids,’ Olivia told Marie Claire.

‘I’m open-minded about how many, but three is like a little party.’

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Anna Duff