So we're still not really sure what this "Cat Daddy" thing is, but it seems really hot chicks enjoy doing it without a lot of clothes on.

Earlier this week, super hot Sports Illustrated swimsuit model Kate Upton hit the interwebs doing the "Cat Daddy" in a bathing suit -- NICE!

But not to be outdone, the equally hot Lisa Ramos and Melanie Iglesias decided to shake their... uh.. cat daddies for the camera too.

So that got us thinking, who did it better? Well, we'll let you decide. Watch the videos, take the poll... but really we all win here!!!