When the flying saucers appeared all around earth, humanity had been expecting a lot of things. It was the general consensus among intellectuals that Earth would have nothing to offer aliens capable of faster than light travel other than 'human resources'. Some of humanity's rulers prepared to nuke Earth itself rather than give the aliens the satisfaction of having it.
Then a humanoid cat in a french maid uniform appeared on every television channel, radio, and internet live-stream on the planet.
"Greetings humans, we have observed your planet for years, and many of our elite have developed a preference for the employment of what your popular culture calls 'cat girl maids.' Our elite was unhappy when they learned they were just an idol image of your civilization. As such, we are offering your lower class the chance to join our new job and species we have created. You will be given genetic and psychological modifications to be proper maids, but your free will remain as much as you have it already in your current social structure.
"We will offer free dental, medical, and guaranteed increase in your current wages. You will not be expected to give any sexual favors for your employment, nor are they necessary nor encouraged for advancement. Our heavily armored transformation and transport ships will be landing in every city around the world, we will be scanning for suicide bombers of course, so don't be afraid."
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"BAH! What a bunch of BS! Who in their right mind would ... Kelly?! KELLY! You worthless brat where are you?!" Shouted the restaurant owner as his underpaid and overworked waitress couldn't run fast enough to the nearest alien vessel.