In 2014, after years out of the spotlight, Hilary Duff released her first new songs of the 2010s. In June 2015, she released her first album in 8 years, Breathe In. Breathe Out. It was great album, launched with the pop single "Sparks" and featuring highlights like the Ed Sheeran penned "Tattoo." But in spite of a strong debut and enthusiasm from fans, the album had little promo after its release. The Breathe In. Breathe Out. era was cut short, and Hilary turned to filming season two of her TV series, Younger. At the beginning of 2016, Hilary released a cover of Fleetwood Mac's "Little Lies" for Younger, and the show was renewed for season three.
Hilary had moved on from Breathe In. Breathe Out., but new music was still on her mind. She seemed undecided about what to do early in 2016, and when she was removed from her label RCA's website in April, fans were worried about her future in music. Luckily, Hilary surprised fans with unexpected studio updates that spring. She was already working on new music - hopefully for a new album - and two song titles were registered that summer. Though she didn't confirm any real plans, Hilary did say her new music was a bit heavier and darker this time around.
However, 2017 brought little news about music or an album. That seemed to be on the backburner as Hilary focuses on Younger and her son. In June 2018, she and boyfriend Matthew Koma announced that they're expecting a baby girl! With a daughter on the way, Hilary confirmed again that she has no current plans to record an album. Naturally, her growing family will take center stage for the foreseeable future.
If Hilary releases another album - it would be her 5th regular studio album, 6th if you include her 2002 holiday record - it likely won't be until at least late 2019. Sometime in the 2020s is more likely.