Thin Layer of Thermal Paste Under CPU Fan?

I recently purchased a Thermaltake CPU fan, and whenever it arrived in the mail today, I took it out of the box, and there was a thin layer of thermal paste on the underside of the CPU fan.

I had originally planned on applying thermal paste to the surface of the CPU, but since there is a thin layer of it on the underside of the CPU fan already, do I still need to apply thermal paste to the CPU surface?