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There must be something in the water.

Eva Mendes, 42, and longtime boyfriend Ryan Gosling, 35, are expecting their second child together, according to Us Weekly.

The news comes on the same day it was reported Blake Lively and Ryan Reynolds have another bun in the oven.

Insiders told the publication that Eva was spotted hiding her bump during a photo shoot in Los Angeles back in February.

And perhaps we shouldn't be too surprised because Eva - who has a 17-month-old daughter Esmeralda with Gosling - recently revealed she was taking a break from her career to focus on her family.

Eva, who met Gosling on the set of "The Place Beyond The Pines" in 2011, told the Today Show in October last year, "If I'm even like, 'Oh, what should I wear? Or, should I do this project?' All I have to think about is my daughter and her face, and I know the answer immediately.

"She's my moral compass in a way."

Esmeralda was born in September 2014 and the couple are yet to share a snap of their little one.

When the "Lost River" actress was pregnant the first time round, she remained resolutely quiet on the matter.

In a December 2014 interview with Elle DeGeneres, the host asked the actress why she had decided to keep mum.

"All moms will understand, you're not supposed to tell anybody during your first… well certainly not the world… in your first trimester," Eva said.

"My mother didn't even know yet. So that would have been an awkward phone call. 'Hey mom did you catch Ellen today?' Um, oops!"

Meanwhile, fellow Hollywood A-lister Blake, 28, is believed to be pregnant with her second child too.

She was spotted filming reshoots on the set of her thriller "The Shallows" and appeared to be covering up a baby bump with a gray sweater over her blue wetsuit.

Neither her or Reynolds have commented, but multiple publications are reporting the news.

The pair already have a daughter, James, who they welcomed at the end of 2014.

Seems like a congratulations all round is in order!