diff --git a/django_gamification/models.py b/django_gamification/models.py
index b15fcc6..08fe182 100644
--- a/django_gamification/models.py
+++ b/django_gamification/models.py
@@ -109,6 +109,20 @@ def save(self, *args, **kwargs):
                 badge.points = self.points
                 badge.save()
 
+    def award(self, interface):
+        """
+        Awards this badge to a user.
+        """
+        badges = interface.badge_set.filter(badge_definition=self)
+        if badges.exists():
+            badge = badges.first()
+            if badge.acquired:
+                return
+        else:
+            badge = Badge.objects.create_badge(self, interface)
+        badge.award()
+        badge.save()
+
 
 class Progression(models.Model):
     """
@@ -198,6 +212,9 @@ class Badge(models.Model):
     objects = BadgeManager()
     acquired_objects = AcquiredBadgesManager()
 
+    class Meta:
+        unique_together = ('interface', 'badge_definition')
+
     def increment(self):
         if self.progression and not self.revoked:
             self.progression.increment()