Olivia Wilde reveals she's pregnant again with sweet Instagram post.

There must be something in the Californian water supply at the moment, because it’s another day, another Hollywood baby announcement.

This time it’s everyone’s favourite funny gal Olivia Wilde, who announced she’s expecting via her Instagram just hours ago.

“Matching baby bumps,” the Vinyl actress wrote, sitting next to her son, Otis, who turns two on Thursday.

Matching baby bumps. ✌️

A photo posted by Olivia Wilde (@oliviawilde) on Apr 18, 2016 at 11:38am PDT

This will be the second child for Wilde, 32, and her fiancee, fellow actor Jason Sudekis, 40.

Speaking with PEOPLE Magazine earlier this month, Wilde said, “I’m desperate for more [kids]! I love my siblings so much and Jason has incredible siblings too. The more the merrier.”

And though it may be a while until they reach mini van status, the growing brood are said to be thrilled.

Wilde and Otis making friends with a bunny. Source: Instagram.

After the birth of Otis, Wilde was candid (and hilarious) in discussing her pregnancy and the effect it had on her body.

"I loved being pregnant," the Her actress told Shape magazine. "I felt unapologetically curvy, sexy, and intensely feminine.

"Then after giving birth I joined the ranks of millions of new mothers when I moaned, 'Why do I still look pregnant?'"

Wilde with her son Otis, last year. Source: Facebook. 

Conceding that the weight doesn't fall away with the baby, Wilde admitted, "For a couple of weeks after you pop that sucker out, you are the walking wounded. That gorgeous bump you paraded around town for some 40 weeks has only retreated slightly after the birth. Now it's a lot like a partially deflated pool toy.

“I’m softer than I’ve ever been, including that unfortunate semester in high school when I simultaneously discovered Krispy Kreme and pot.”

Olivia Wilde and fiancee Jason Sudekis. Source: Instagram.

Not a subscriber to the green smoothie and pregnancy yoga handbook, Wilde admitted that just like many other mere mortals, her pregnancy cravings were a little more low brow.

"I like beer. And pizza. And these two ingredients are not found in the purely fictional book I like to call How To Look Like You Never Made a Human: A Guide To Socially Acceptable Motherhood."

Preach, Olivia. (And please document it all on social media for us!)

It is not known when their genetically blessed bundle is set to arrive, but since being posted less than 12 hours ago the photo has already generated close to 70,000 likes.

Congratulations Olivia and Jason!