On April 12, 2014, Stefani made a surprise appearance at the Coachella festival, where she joined Pharrell Williams onstage during his set to perform “Hollaback Girl”. On April 29, it was officially confirmed that Stefani would join the seventh season of The Voice as a coach, replacing Christina Aguilera. After nine years since the last time, she attended the 2014 MTV Video Music Awards, and during an interview on the red carpet she said, “I didn’t know I was gonna have a baby, I didn’t know I was gonna be on The Voice, I didn’t know I was gonna be writing new music, so I’m just like, what’s gonna be next?”. Stefani appears as a featured artist on Maroon 5‘s song “My Heart Is Open“, co-written by Sia Furler, from the band’s album V, which was performed for the first time with Adam Levine and an orchestra at the
2015 Grammy Awards. Stefani also collaborated with Calvin Harris on the track “Together” from his album Motion.
On September 8, 2014, Stefani told MTV News during New York Fashion Week that she was working on both a No Doubt album and a solo album. She also revealed that she was working with Williams. Stefani released her comeback single “Baby Don’t Lie” on October 20, 2014, co-written with producers Ryan Tedder, Benny Blanco, and Noel Zancanella. Billboard announced that her third studio album was set to be released in December with Benny Blanco serving as executive producer. In late October, a sneak peek of a new track from Stefani’s third album, named “Spark the Fire“, was premiered. The song was produced by Pharrell Williams. On November 23, the full song premiered online and was made available for download on December 1. Both “Baby Don’t Lie” and “Spark the Fire” were later scrapped from Stefani’s third album. On January 13, 2015, Stefani and Williams also recorded a song titled “Shine“, for the Paddington soundtrack. Stefani and Sia Furler worked together on a ballad, called “Start a War” which was expected to be released on Stefani’s third studio album as well, however it didn’t make the final cut. On July 10, 2015, American rapper Eminem featured Stefani on his single “Kings Never Die“, from the Southpaw film soundtrack. The track debuted and peaked at number 80 on the Billboard Hot 100 chart, and matched first-week digital download sales of 35,000 copies.
On October 17, 2015, Stefani performed a concert as part of her MasterCard Priceless
Surprises tour series at the Hammerstein Ballroom in New York City, where she performed a new song about her breakup with ex-husband Gavin Rossdale, titled “Used to Love You“. It was released as a download on October 20, 2015. The video was released later that same day. The song was released to Mainstream radio in the U.S. on October 27, 2015. The track is the first official single off her third solo album This Is What the Truth Feels Like, which she began working on summer 2015. Stefani said much of the previous material she worked on in 2014 felt forced and inauthentic, the opposite of what she had originally wanted. The album’s second single, “Make Me Like You“, was released on February 12, 2016. This Is What the Truth Feels Like was released on March 18, 2016, and debuted at number one on the Billboard 200 with 84,000 album–equivalent units sold in its first week, earning Stefani her first number-one album on the chart as a solo artist. To further promote the album, Stefani embarked on her This Is What the Truth Fee lLike Tour with rapper Eve in the United States. The singer voiced DJ Suki in the animated film Trolls, which was released on November 4, 2016.] She is also included on five songs from the film’s official sound track.On September 8, 2016, Stefani announced that she would be performing at the final two shows at the Irvine Meadows Amphitheatre for October 29–30, as part of an event called Irvine Meadows Amphitheatre Final Shows.]Additionally, American rock band Young the Giant will open for the two shows.[