Sen. Kirsten Gillibrand just got caught not living up to her own rhetoric about “believing all women”: Her office plainly took a dive in “investigating” sexual-harassment accusations against one of her top aides.

The senator insists the complaining staffer, who resigned in angry frustration, was treated seriously “every step” of the way. Besides, she added, “I told her that we loved her at the time.” Lucky her.

Meanwhile, the aide, Abbas Malik, kept his job with only a “final warning” after allegedly making unwanted advances and misogynistic remarks, intimidating the staffer and then retaliating after she complained.

All of which sounds a lot worse than what then-Sen. Al Franken did before Gillibrand led the charge for his resignation.

And it gets worse. For starters, Gillibrand’s office investigated the complaint itself — a process the senator condemns when done by the military. It concluded that Malik’s conduct, while “inappropriate, did not rise to the level of sexual harassment.”

Then Politico spoke with ex-staffers, as the complainant suggested — none of whom the senator’s people had bothered to contact. When the reporters brought those findings to Team Kirsten, and before Politico published the story, Malik was fired.

Not the response you’d expect from someone who has made harassment and other women’s issues the basis of her campaign.

But it’s precisely what we’ve come to expect from a senator who’s shown time and again that she’ll drop any “principled” position whenever it’s to her advantage.

Voters outside New York are now meeting the real Kirsten Gillibrand: a complete hypocrite — even on her signature issue.