Chapter Two: Red. The final EP, Chapter Three: Yellow was released on October 6, 2017. In August 2017, Miller's song "Brand New Eyes" was featured in the trailer to the film Wonder, directed by Stephen Chbosky and starring Julia Roberts and Owen Wilson. Miller's second full-length album and debut international album Aurora was released on February 23, 2018. It includes all the songs from the three previous extended plays (dubbed as "chapters"), along with five new tracks. Miller had a hand in writing all but one of the songs on Aurora, on topics about "everything from existential boredom to slut shaming". She performed "S.L.U.T.", the album's lead single, on MTV's TRL on February 12, 2018. She conceived of the song as a way to reclaim the word's negative connotations as the positive acronym "sweet little unforgettable thing". She was featured on vocals on the 2018 NOTD single "I Wanna Know", released in March 2018. The song went Gold in the US and is Platinum in several countries, including Australia, Canada, the United Kingdom and Sweden. She performed the song live on Today in June 2018. She also promoted the single at multiple shows and acoustic sets. 2019–present: Touring and Elated! In February 2019, Miller announced her first headlining tour titled "Nice To Meet U Tour". On March 1, she released the lead single off her upcoming third studio album, titled "It's Not U It's Me", which is a collaboration with American R&B singer 6lack. Following this, she released the single "Feel Something" and announced her "Sunsets in Outerspace Tour". In August 2019, Bea Miller released the single "Feels Like Home" with Canadian singer-songwriter Jessie Reyez. A collaboration with production team Snakehips titled, "Never Gonna Like You", was released in September 2019. Miller released the single "That Bitch" in November 2019, independently from her record label. She portrayed League of Legends character Evelynn in the virtual musical group K/DA for "The Baddest" a single from K/DA's EP All Out. In September 2020, Bea Miller would release a series of compilation EPs which consisted of; Quarantine on September 4, Sad Boy Hours on September 18 and Lust on September 24. On October 7, 2020, Bea Miller announced the release of the single "Wisdom Teeth" which would be released on October 9 and serve as the lead single to Miller's EP Elated!, which was released on October 23, 2020. On November 6, 2021,