Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Yes, just use the same "Messages" app you use for text messaging. Click the camera button on the left of the text entry box to attach media. If the camera button is not there, enable it in settings > messages. I believe you need to be running 3.x or higher for MMS.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.