I Hope You're Happy" is a song by American electronic music duo the Chainsmokers featuring American rock band Blink-182, released on December 6, 2019, as the tenth and final single from the duo's third studio album, World War Joy, which was released on the same day.

In the second verse of "Closer", the 2016 song by the Chainsmokers, featured singer Halsey mentioned a Blink-182 track that was later revealed to be "I Miss You" and also sang "Play that Blink-182 song/That we beat to death in Tucson.

[6] On May 2, the Chainsmokers posted a photo on their social media showing them accompanied by Hoppus and captioning "chains 182".

[9][10] Mark Hoppus, equipped with his bass, joined The Chainsmokers while Travis Barker, member of the rock band, already behind his drum kit, ascended from the bowels of the stage.

[12][13] Then, on December 1, the Chainsmokers unveiled on their social media the release date and the cover art of the song.