What Would Happen if Curiosity Mars Rover Sends Pictures of Some Aliens to US?

They would be covered up

We will never know.

Even aliens wouldn't be stupid enough to live on mars.
But they don't exist, so it's all hypothetical.

An image has already been leaked, albeit very briefly until it was deleted from the internet. The image was mostly airbrushed out, but in all honesty it was a waste of time because what lurked behind the airbrushing looked utterly disturbing if indeed the airbrushed image was real to start with.

NASA's budget would be increased tenfold.

Don't give them any ideas.