During the band's hiatus, Stefani embarked on a solo pop career in 2004 by releasing her debut studio album Love. Angel. Music. Baby. Inspired by pop music from the 1980s, the album was a critical and commercial success. It spawned six singles, including "What You Waiting For?", "Rich Girl", "Hollaback Girl", and "Cool". "Hollaback Girl" reached number one on the Billboard Hot 100 chart while also becoming the first US download to sell one million copies. In 2006, Stefani released her second studio album, The Sweet Escape. Among the singles were "Wind It Up" and "The Sweet Escape", the latter of which was number three on the Billboard Hot 100 year-end chart of 2007. Her third solo album, This Is What the Truth Feels Like (2016), was her first solo album to reach number one on the Billboard 200 chart. Her fourth solo album and first full-length Christmas-themed album, You Make It Feel Like Christmas, was released in 2017 and charted 17 tracks on Billboard's Holiday Digital Song Sales component chart in the United States. Stefani has released several singles with Blake Shelton, including "Nobody but You", which reached number 18 on the Billboard Hot 100 in 2020.