halloween costume Gwen Stefani spandex Spread Pictures

Gwen Stefani was snapped at the Jonathan Ross Halloween party in London on Wednesday night, and we're still not sure what she was, but she looked amazing. Seeing as she has a fake gash on her head and a slit throat, that's saying a lot!

Gwen and her family are currently enjoying some time in the UK before she goes on tour with No Doubt in late November, and she arrived at Heathrow Airport on Wednesday morning with her youngest son Zuma, joining hubby Gavin Rossdale and their oldest son Kingston.