Ryan Gosling as Ken and Margot Robbie as Barbie in Barbie. Looks from the summer hit are one of the top Halloween costume choices this year. Photo: Warner Bros
Ryan Gosling as Ken and Margot Robbie as Barbie in Barbie. Looks from the summer hit are one of the top Halloween costume choices this year. Photo: Warner Bros

No Barbie or Ken: Hollywood writers' union Halloween rules annoy stars