Save the user from one model to the another model

What I want to do is, whenever I create a new message, I want the sender of the Message to be added to the user of the Thread. How do I do that?

 

class Thread(models.Model):
    user = models.ManyToManyField(User)
    is_hidden = models.ManyToManyField(User, related_name='hidden_thread', blank=True)

    def __unicode__(self):
        return unicode(self.id)

class Message(models.Model):
    thread = models.ForeignKey(Thread)
    sent_date = models.DateTimeField(default=datetime.now)
    sender = models.ForeignKey(User)
    body = models.TextField()
    is_hidden = models.ManyToManyField(User, related_name='hidden_message', blank=True)

    def __unicode__(self):
        return "%s - %s" % (unicode(self.thread.id), self.body)

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