Gwen Stefani Kingston Batgirl bruentte party

And son Kingston as... her tiger cub? Okay, it might not make sense, but we adore their costumes. The always hip Gwen Stefani and her best boy hit up a Halloween party in Bev Hills over the weekend and, even though we think the No Doubt singer could've worn a sexier outfit, we still think the mother and son make an unbeatable duo!