'Check if the authenticated user starred username/repo.
:param str username: (required), owner of repository
:param str repo: (required), name of repository
:returns: bool'

@requires_auth
def is_starred(self, username, repo):

    json = False
    if (username and repo):
        url = self._build_url(u'user', u'starred', username, repo)
        json = self._boolean(self._get(url), 204, 404)
    return json
