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That White Girl Rosé must be powerful stuff.

Page Six is told that Internet comedian Josh Ostrovsky, a.k.a. the Fat Jew, is preparing to announce that he’s having a baby with a woman who is not his wife, Katie Sturino.

The news may help to explain why Sturino, who runs the 12ish Style blog, filed for divorce last month, as Page Six first reported.

We’re told that the mother of the baby is expected to give birth “soon” and a rep for Ostrovsky told us, “It’s a personal matter, and the woman involved insists on her privacy.”

However, we’re told famously unprivate Ostrovsky — who produces his own line of wine, White Girl Rosé, in addition to running his popular Instagram account — will announce the news on “The Wendy Williams Show” on Wednesday.

Ostrovsky and Sturino, who lived in Tribeca, were married in 2014 and have no children but share three dogs.

When we first reported on the split, Ostrovsky told us it was amicable, adding, “We intend to be friends, which sounds impossible and progressive and European, but we’ll give it a shot!”