Khloe Kardashian Goes Undercover ... I Ain't Talking 'bout No Kartrashians!

Khloe Kardashian aged about 50 years, and she's now from Albuquerque -- at least if you fell for her Hollywood makeup trickery on a tour bus.

Kendall and Kylie Jenner joined their big sister on a Hollywood tour this afternoon, and all 3 were unrecognizable in their costumes -- especially Khloe, who posed as an old woman ... and Kendall, who looked like a red-headed Madonna.

Kudos on the brilliant makeup job -- we're guessing it's for Khloe's TV show -- but they screwed up royally by NOT getting on the TMZ Celebrity Tour!! Then again, we definitely would've talked "Kartrashians." Sorry, Khloe.