Minou minou!

un chat = a cat (the 't' is silent)
un chaton = a kitty
une chatte = a female cat/pussy
un minou = baby talk for kitty

Some interesting expressions:
donner sa langue au chat = to give in (to give one's tongue to the cat)
il n'y a pas un chat = the place is deserted (there's not even a cat)
avoir un chat dans la gorge = to have a frog in one's throat (to have a cat in one's throat)
retomber comme un chat sur ses pattes = to fall on one's feet (...like a cat)
il ne faut pas réveiller le chat qui dort = let sleeping dogs lie (don't wake up a sleeping cat)
s'entendre comme chien et chat = to fight like cat and dog