Billie Eilish looked unrecognizable as she was spotted filming the upcoming movie The Bell Jar in Toronto this week.The 24-year-old singer-turned-actress will make her big-screen debut in Sarah Polley’s adaptation of the classic Sylvia Plath book.Eilish was dressed in a patterned yellow dress, keeping warm between scenes in an oversized green fleece worn over the flimsy frock.She carried a large black water bottle and wore black boots while walking around on the location set.At another point, the Bad Guy singer was dressed in a large, button-up light blue shirt with the sleeves rolled up. Actress Carey Mulligan, 41, who plays Eilish’s mom in the movie, was also on set. Billie Eilish was spotted filming the upcoming movie The Bell Jar in Toronto this week The 24-year-old singer-turned-actress will make her big-screen debut in Sarah Polley’s adaptation of the classic Sylvia Plath bookIn March, it was reported that the pop star was ‘in advanced talks’ to be cast in the project.And now the music artist has officially taken on the role of 19-year-old Boston student Esther Greenwood.In Plath’s story, Esther’s clinical depression leads to a suicide attempt and hospitalization after she lands a glamorous internship in New York City in 1953.Similarly, Eilish has been open throughout her career about her struggle with depression, anxiety and self-harm.Esther, who undergoes ECT shock therapy in the narrative, is on a quest to forge an identity in an oppressive patriarchal society.The book title is a metaphor for the sense of suffocation brought on by the main character’s precarious mental state.The Bell Jar is Polley’s fifth directorial feature, following 2022’s Women Talking, 2012’s Stories We Tell, 2011’s Take This Waltz, and 2006’s Away from Her.Mulligan’s casting was revealed by Variety just one week ago. The Bad Guy singer was dressed in a large, button-up light blue shirt with the sleeves rolled up as she took a call Actress Carey Mulligan, 41, who plays Eilish’s mom in the movie, was also on setThe actress is fresh off the success of her starring role in Beef season two, which hit Netflix this past spring.Her previous work includes the movies An Education, Promising Young Woman and the Bradley Cooper-helmed Maestro.She has earned three Oscar nominations throughout her career, and recently received a Best Supporting Actress BAFTA nomination for The Ballad of Wallis Island.According to Variety, Heated Rivalry sensation Connor Storrie is rumored to also have a role in The Bell Jar.Plath’s book has long been believed to be a semi-autobiographical depiction as the author was offered an internship at Mademoiselle in 1953 before becoming a patient at the upscale McLean Hospital.She took her own life at age 30.The posthumous Pulitzer Prize winner published her only book in 1963 under the pseudonym Victoria Lucas before her name was eventually attached to it.