Article continues below advertisementWhen Did Hilary Duff Announce Her Music Comeback?Source: @hilaryduff/InstagramHilary Duff confirmed she is working on new music.Hilary Duff is emerging from her musical hibernation with a new album!On September 9, the 37-year-old singer-actress revealed she's working on new music, 10 years after releasing her last album, Breathe In. Breathe Out., which came out in 2015. A press release revealed Duff signed with Atlantic Records for her musicial comeback.