Who played Barbie in 'Barbie' (2023)?

Which actress won the Academy Award for Best Actress for 'Everything Everywhere All at Once'? Which singer played Ally in 'A Star Is Born' (2018)? Who played Elvis Presley in Baz Luhrmann's 'Elvis' (2022)? Who played Paul Atreides in 'Dune' (2021)? Who played Ken in 'Barbie' (2023)? Who played Sebastian in 'La La Land'? Who played Andrew in 'Whiplash' (2014)? Which actor won an Oscar for playing the music teacher in 'Whiplash'?