From the SRD
Spontaneous Casting and Metamagic Feats: Clerics spontaneously casting cure or inflict spells can cast metamagic versions of them. Casting a 1-action metamagic spell spontaneously is a full-round action, and spells with longer casting times take an extra full-round action to cast.
Jeph said:Example: Hi, I'm a Cleric 15. I want to sub out a 4th level spell for a Silent, Still, Cure Moderate Wounds spontaneously. Can I do this?
dkilgo said:I have a cleric that has a few metamagic feats, and he uses them whenever the time arises.
Shadowlore said:
Wow, you have a really lenient DM!
Page 78 of the PH states that divine SCs and wizards must prepare them as metamagic when they are prepared.