:class:`Profile` instance of the Post's owner.

def owner_profile(self) -> 'Profile':
        """:class:`Profile` instance of the Post's owner."""
        if not self._owner_profile:
            if 'username' in self._node['owner']:
                owner_struct = self._node['owner']
            else:
                # Sometimes, the 'owner' structure does not contain the username, only the user's ID.  In that case,
                # this call triggers downloading of the complete Post metadata struct, where the owner username
                # is contained.
                # Note that we cannot use Profile.from_id() here since that would lead us into a recursion.
                owner_struct = self._full_metadata['owner']
            self._owner_profile = Profile(self._context, owner_struct)
        return self._owner_profile