After a worldwide fan-event tour, Barbie finally made its debut July 9 at the film’s world premiere in L.A., on a pink carpet transformed into a real-life Barbie Land, complete with Barbie’s Dream House and a beach with a lifeguard tower. Stars Margot Robbie, Ryan Gosling, Issa Rae, America Ferrera, Simu Liu, Hari Nef, Kate McKinnon and Michael Cera joined soundtrack artists Billie Eilish, Nicki Minaj and Dua Lipa at the event, along with director/co-writer Greta Gerwig, who weighed in on the viral response to Robbie’s Barbie foot. Saying she didn’t expect the reaction to the already iconic foot — which stays arched even when stepping out of her heels — Gerwig explained, “I did always think of the arched foot as like a bat signal, but everybody was like,…