2 Iphones 1 Apple ID

I'm sure this has been asked may times already.

I have 2 Iphones (me and my girlfriend). Is there away we can have separate Iclouds but only one Apple ID as our cloud is full. I don't want to have to pay for apps twice.

via iLounge Forums http://forums.ilounge.com/iphone/279697-2-iphones-1-apple-id.html