iPhone print using iMacs printer?

I just bought a late 2009 27" iMac, my first iMac and what a near perfect machine! It found my HP 2100M LaserJet printer after I plugged it in using a parallel to USB adapter and it works perfectly. (With the PC it was always a several hour hassle!) My wife and I both have iPhones but no wireless printer and wonder if there's an easy way to print wirelessly? We have a Time Capsule.
Running OSX 10.7.5 and I've posted another thread on upgrading to 10.8.3. Is there a way or an app that will allow me to print using the iMac's printer with wireless?
Thanks
Hank