Mouse in the House Sends Whitney Running

A few uninvited vermin had Whitney Port running for the door of her own apartment -- and no, we're not talking about a visit from Speidi.

TMZ has learned "The City" star put herself up in two different swanky NYC hotels this week after she and BFF Joanna Scapa found an unwelcome party of mice creepin' around her pad.

We're told the gals didn't even bother to change out of their PJs -- immediately booking it to the Cooper Square Hotel while still in their jammies.

Whitney's been waiting it out there and at the nearby Bowery Hotel ever since.

She'll return home once exterminators finish doing their thing.