Does OSX Lion come with iPhoto?
Lion (or any other OS X operating system) doesn't come with iPhoto by default. However, iPhoto, iMovie, and Garageband are normally installed on new systems.

You'll have to install iPhoto if it's not on your system. Each new Mac does get some version of iLife, so you may be able to check from Apple the version of the OS that shipped with your hardware at http://apple.com/support/manuals and search to see what your options are.